CN104298861B - A kind of computational methods of reinforcement yielding power - Google Patents
A kind of computational methods of reinforcement yielding power Download PDFInfo
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Abstract
The present invention proposes a kind of computational methods of reinforcement yielding power, solves the defects of reinforcement yielding power in the prior art does not have specific calculation formula to cause the accuracy of yield force cannot be guaranteed.It comprises the following steps：(1)：Input parameter is pre-processed, obtains maximum, force, minimum yield force threshold values, maximum yield strength threshold values, force value sequence and Displacement Sequence；(2)：Force use value time series determines yield force；(3)：If the result that step (2) returns is true, operating procedure (5)；If the result that step (2) returns is false, operation is in next step；(4)：Force use value rate of change calculates yield force；(5)：Yield force and lower yield force in output.Result of calculation of the present invention is accurate, during experiment, it is not necessary to using extensometer and displacement transducer, can effectively remove sawtooth point and fixture steps up the influence of process, suitable for the steel bar test of any material.
Description
Technical field
The present invention relates to a kind of computational methods, more particularly to a kind of computational methods of reinforcement yielding power.
Background technology
Standard GB/T228.1-2010 (metal material stretching test part 1s：Room temperature test method) in give reinforcing bar
The definition of yield strength is tested, and gives the figure of four kinds of situations, but without specific calculation formula.Yield force, which is equal to, bends
Take intensity and multiply reinforcing steel area.The computational methods of the yield force of in the market are rested in the hand of each testing machine controller producer,
Method disunity, horizontal very different, the algorithm of neither one standard.The calculating of yield force is by fixture, testing machine observing and controlling ring
Save, the influence of the influence, particularly fixture of testing crew theoretical water equality many factors.After testing machine usage time has been grown,
More metallic particles between fixture and testing machine be present, cause occur the curve with zigzag fashion during experiment.
The definition of steel bar test yield force is formulated according to the curve of power-extension, and the mistake of steel bar test is done by most laboratory
In journey and without using extensometer (equipment of the extension of acquisition), yield force can not be calculated according to definition at all.Most experiment
Machine controller producer replaces power-extension curve using force-displacement curve, and A partial experiment room is even without installation displacement coding
Device equipment, the accuracy of yield force cannot be guaranteed.Steel bar test initial stage, it may appear that the clamping of a moment of fixture and reinforcing bar
Phenomenon, so asking for such case must being excluded to reinforcement yielding power.
Therefore in view of the above-mentioned problems, it is necessary to design a kind of computational methods of reinforcement yielding power to make up drawbacks described above.
The content of the invention
The present invention proposes a kind of computational methods of reinforcement yielding power, and it is not specific to solve reinforcement yielding power in the prior art
Calculation formula the defects of causing the accuracy of yield force cannot be guaranteed.Result of calculation of the present invention is accurate, during experiment, no
Extensometer and displacement transducer are needed to use, sawtooth point can be effectively removed and fixture steps up the influence of process, suitable for any material
The steel bar test of material.
The technical proposal of the invention is realized in this way：
A kind of computational methods of reinforcement yielding power, it comprises the following steps：(1)：Input parameter is pre-processed, obtained
Maximum, force, minimum yield force threshold values, maximum yield strength threshold values, force value sequence and Displacement Sequence；The input parameter includes original
Force value sequence, original Displacement Sequence and fixture displacement；(2)：Force use value-time series determines yield force；(3)：If step
(2) result returned is true, then operating procedure (5)；If the result that step (2) returns is false, operation is in next step；(4)：Make
Firmly value changes rate calculates yield force；(5)：Yield force and lower yield force in output.
Further, the preprocess method in step (1) comprises the following steps：(11) by original force value sequence, original displacement
Negative value in sequence is stored in new force value sequence, Displacement Sequence respectively after being deleted；(12) minimum yield force threshold values is most
Energetically 55%, maximum yield strength threshold values is the 99% of maximum, force.
Further, force use value-time series determines that the method for yield force comprises the following steps in step (2)：(21)：Make
Flex point set on surrender section is obtained with the method for obtaining flex point in force value, the upper flex point obtained index set is put into force value
Flex point set chained list；(22)：If the number of element is 0 in flex point set in force value, function returns to vacation, if flex point in force value
The number of element is more than 0 and enters step (23) in set；(23)：Application method obtains the upper yield force rope after force value sequence fit
Draw；(24)：If step (23) returns to vacation, upper yield force index takes first upper flex point index value in step (22)；If step
Suddenly (23) return true, and upper yield force index takes the return value of function；(25)：Application method asks for flex point set under force value sequence,
Put the lower flex point obtained index set under force value flex point set chained list；(26)：If element in flex point set under force value
Number is 0, and lower yield force index takes yield force index value, into step (28)；If element in flex point set under force value
Number is more than 0, and application method obtains lower yield force index value, into step (27)；(27)：If obtain lower yield force index value
Method return false, lower yield force index takes yield force index value；If the method for obtaining lower yield force index value returns very,
Lower yield force index takes function return value；(28)：If upper surrender force value is less than lower surrender force value, lower yield force index modification is
First value under force value in flex point set；(29)：Function returns true.
Further, the method for obtaining flex point in force value comprises the following steps：(211)：Ask for flex point set in force value, and power
Value needs while the condition of satisfaction is：The force value is more than former point force value, and latter point force value is less than or equal to the force value, the point
Force value is more than minimum yield force threshold values, and the force value is less than maximum yield strength threshold values；(212)：If flex point set in force value
Element number is more than 0, returns true；If the element number in force value in flex point set is equal to 0, return false.
Further, the method for obtaining yield force index in matched curve comprises the following steps：(231)：Obtain fitting force value
Sequence, the average value for taking the force value and front and rear each 10 points is fitting force value；(232)：Obtain in fitting force value arrangement set
First upper flex point index iIndex, and use the method for obtaining flex point in force value；(233)：If step (232) is obtained
First upper flex point index iIndex is sky, and function returns false；Obtained in force value sequence first in distance fitting force value sequence
Index iUpIndex in individual upper flex point index iIndex；(234)：Function returns true.
Further, the method for obtaining flex point under force value comprises the following steps：(251)：Ask for flex point set under force value；Force value
The condition for needing to meet simultaneously is：The force value is less than or equal to former point force value, and latter point force value is more than the force value, the power
Value is more than minimum yield force threshold values, and the force value is less than maximum yield strength threshold values；(252)：If the member of flex point set under force value
Plain number is more than 0, returns true；If the element number in force value in flex point set is equal to 0, return false.
Further, the method for obtaining lower yield force comprises the following steps：(261)：If element in flex point set under force value
Number be 0, function returns false；(262)：Under force value in flex point set, minimum force value after input parameter is asked for；
(263)：Function returns true.
Preferably, also comprise the following steps between step (3) and step (4)：(6)：Force use value-Displacement Sequence determines to bend
Take power；(7)：If the result that step (6) returns is true, operating procedure (5)；If the result that step (6) returns is false,
Operating procedure (4).
Further, force use value-Displacement Sequence determines that the method for yield force comprises the following steps in step (6)：(61)：Such as
The number of element is 0 in fruit Displacement Sequence, or fixture displacement is less than 0, and function returns false；(62)：Calculate fixture displacement
Value foffset02 corresponding to 0.2%；(63)：Calculated using GetMinDistance methods in Displacement Sequence apart from step (62)
Index iIndex02 of the value nearest foffset02 that calculates in Displacement Sequence；(64)：Use GetMinDistance side
Method calculates index of the value nearest apart from the value of maximum, force m_Maxforce*1/2 in force value sequence in force value sequence
iMaxIndex50；(65)：The maximum, force m_Maxforce*1/ in force value sequence is calculated using GetMinDistance methods
Index iMaxIndex10 of the nearest value of 10 value in force value sequence；(66)：Plastic property of reinforcement rebar in force-displacement curve is obtained to become
The slope of shape；Its calculation procedure is：Index iMaxIndex50 is obtained first with indexing poor v1s of the iMaxIndex10 to stress value；
The poor v2 of index iMaxIndex50 displacements corresponding with indexing iMaxIndex10, slope=v1/v2 are obtained again；(67)：Use
GetCloseSlopeIndex methods are obtained in force-displacement curve, after iIndex02 is indexed, force value and index iIndex02
Index iYieldIndex of the point of the slope distance minimum of displacement in force value sequence；(68)：Upper and lower yield force index takes step
Suddenly the index iYieldIndex obtained in (67)；(69)：Function returns true.
Further, the method for force use value rate of change calculating yield force comprises the following steps in step (4)：(41)：From power
The yield force section for meeting threshold values above and below surrender is obtained in value sequence；The value in yield force section fall minimum yield force threshold values with most
Between big yield force threshold values；(42)：If element number is 1 in yield force section, upper and lower yield force takes the value of the element；Such as
Element number is 2 in fruit yield force section, and upper and lower yield force takes the value of last element of yield force section；Function returns；
(43)：Ask for the set of slope in yield force set；The computational methods of slope are：The latter element is taken in yield force section with before
The difference of one element；(44)：Ask for the set of slope variation rate in yield force set of slopes；The computational methods of slope variation rate
For：Take the difference of the latter element and previous element in yield force section；(45)：Ask in yield force slope variation rate most
It is worth the index iYieldIndex in force value sequence greatly；(46)：Upper and lower yield force index takes index iYieldIndex；
(47)：Function returns.
Reinforcement yielding power computational methods disclosed by the invention, it is by using force value-time series, force value-Displacement Sequence
Determine that yield force and force value rate of change calculate yield force, its result of calculation is accurate, during experiment, it is not necessary to using extensometer and
Displacement transducer, can effectively remove sawtooth point and fixture steps up the influence of process, suitable for the steel bar test of any material.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is the required accompanying drawing used in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can be with
Other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 is the total frame diagram of algorithm of reinforcement yielding power computational methods of the present invention；
Fig. 2 is the algorithm frame figure that force value of the present invention-time series calculates yield force；
Fig. 3 is the algorithm frame figure that force value of the present invention-Displacement Sequence calculates yield force；
Fig. 4 is the algorithm frame figure that force value rate of change of the present invention calculates yield force；
Fig. 5 is the method frame figure that the present invention obtains inflection method in force value；
Fig. 6 is the method frame figure that the present invention obtains yield force indexing means in matched curve；
Fig. 7 is GetFitValue of the present invention method frame figure；
Fig. 8 is the method frame figure that the present invention obtains yield force in matched curve；
Fig. 9 is the method frame figure that the present invention obtains inflection method under force value；
Figure 10 is the method frame figure that the present invention obtains lower yield force method；
Figure 11 is GetMinDistance method frames figure of the present invention；
Figure 12 is GetCloseSlopeIndex of the present invention method frame figure.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, rather than whole embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other under the premise of creative work is not made
Embodiment, belong to the scope of protection of the invention.
In order to contribute to and clarify the description of subsequent embodiment, carried out in the embodiment invented this hair detailed
Before explanation, part term is explained, following explanation is applied to this specification and claims.
IIndex, iUpIndex for occurring in the present invention, foffset02, iIndex02, iMaxIndex50,
iMaxIndex10、iYieldIndex、m_UpInflexion、m_DownInflexion、lTempforce、lTempSlope、
LTempSlopeChange, fTemtp, fTemtpo, fMinTemp, fvalue, lforce are symbol code, without other realities
Matter meaning.
The GetMinDistance Chinese meaning is acquisition minimum range；GetCloseSlopeIndex Chinese, which looks like, is
Obtain and indexed closest to slope；The GetFitValue Chinese meaning is acquisition force value；The GetMinYieldForce Chinese meaning
To obtain lower yield force；The GetUpInflexion Chinese meaning is flex point in acquisition force value；
The GetFitUpInflexionIndex Chinese meaning indexes to obtain yield force in matched curve；GetDownInflexion's
The Chinese meaning is flex point under acquisition force value；The fslope Chinese meaning is slope；The fMaxValue Chinese meaning is maximum；
The TempSlope Chinese meaning is set of slopes；The TempSlopeChange Chinese meaning is the set of slope variation rate；
The Tempforce Chinese meaning is yield force section；M_Maxforce Chinese means maximum, force；
The GetFitUpInflexion Chinese meaning is yield force in acquisition matched curve；GetMinDistance Chinese, which looks like, is
Obtain in force value sequence apart from some force value apart from minimum force value；The GetCloseSlopeIndex Chinese meaning is acquisition slope
Force value closest to some value indexes；The GetFitValue Chinese meaning is force value after acquisition fitting.
Yield force is stress when material starts to produce macroscopic view plastic deformation；The definition of yield strength is：More than this limit
External force effect, it will make part permanent failure, cannot recover, this pressure is called yield strength.
Reference picture 1, a kind of computational methods of reinforcement yielding power, it comprises the following steps：(1)：Input parameter is carried out pre-
Processing, obtains maximum, force, minimum yield force threshold values, maximum yield strength threshold values, force value sequence and Displacement Sequence；The input parameter
Including original force value sequence, original Displacement Sequence and fixture displacement；(2)：Force use value-time series determines yield force；(3)：
If the result that step (2) returns is true, operating procedure (5)；If the result that step (2) returns is false, run next
Step；(4)：Force use value rate of change calculates yield force；(5)：Yield force and lower yield force in output.
In the present invention, original force value sequence, original Displacement Sequence and fixture displacement are from testing machine by testing machine controller
After the sensor of upper installation obtains, Testing Software is sent to；Maximum, force is to be calculated by Testing Software according to force value sequence
's.
Maximum, force algorithm is as follows：The first step：First assume that first number in sequence is " maximum "；Second step：By sequence
In next number compared with " maximum ", if it is more than this " maximum ", it is this number to be at this moment assumed by " maximum "；The
Three steps：If there is other numbers in sequence, second step is repeated；4th step：In the sequence until untill no comparable number, this
When " maximum " that assumes be exactly maximum in this sequence.
Preprocess method in step (1) comprises the following steps：(11) by original force value sequence, original Displacement Sequence
Negative value is stored in new force value sequence, Displacement Sequence respectively after being deleted；(12) minimum yield force threshold values is maximum, force
55%, maximum yield strength threshold values is the 99% of maximum, force.
Further, force use value-time series determines that the method for yield force comprises the following steps in step (2)：(21)：Make
Flex point set on surrender section is obtained with the method for obtaining flex point in force value, the upper flex point obtained index set is put into force value
Flex point set chained list；(22)：If the number of element is 0 in flex point set in force value, function returns to vacation, if flex point in force value
The number of element is more than 0 and enters step (23) in set；(23)：Application method obtains the upper yield force rope after force value sequence fit
Draw；(24)：If step (23) returns to vacation, upper yield force index takes first upper flex point index value in step (22)；If step
Suddenly (23) return true, and upper yield force index takes the return value of function；(25)：Application method asks for flex point set under force value sequence,
Put the lower flex point obtained index set under force value flex point set chained list；(26)：If element in flex point set under force value
Number is 0, and lower yield force index takes yield force index value, into step (28)；If element in flex point set under force value
Number is more than 0, and application method obtains lower yield force index value, into step (27)；(27)：If obtain lower yield force index value
Method return false, lower yield force index takes yield force index value；If the method for obtaining lower yield force index value returns very,
Lower yield force index takes function return value；(28)：If upper surrender force value is less than lower surrender force value, lower yield force index modification is
First value under force value in flex point set；(29)：Function returns true.
As shown in Fig. 2 by taking specific operate as an example, explain that force use value of the present invention-time series calculates the side of yield force
Method, step 1：Flex point set on surrender section is obtained using GetUpInflexion methods, the upper flex point obtained is indexed and gathered
Put m_UpInflexion chained lists into；Step 2：If the number of element is 0 in m_UpInflexion, function returns false；If
The number of element is more than 0 and enters step 3 in m_UpInflexion；Step 3：Use GetFitUpInflexionIndex methods
The upper yield force index of (removing sawtooth) after acquisition force value sequence fit；Step 4：If step 3 returns to vacation, upper yield force index
Take first upper flex point index value in step 2.If step 3 returns very, upper yield force index takes the return value of function；Step 5：
Flex point set under force value sequence is asked for using GetDownInflexion methods, puts the lower flex point obtained index set into m_
DownInflexion chained lists；Step 6：If the number of element is 0 in m_DownInflexion, lower yield force index, which takes, bends
Power index value is taken, into step 8；If the number of element is more than 0 in m_DownInflexion, use
GetMinYieldForce obtains lower yield force index value；Step 7：If GetMinYieldForce methods return to vacation, lower to bend
Take power index and take yield force index value；If GetMinYieldForce methods return very, lower yield force index takes function to return
Return value；Step 8：If upper surrender force value is less than lower surrender force value, lower yield force index modification is gathered for m_DownInflexion
In first value；Step 9：Function returns true.
The method for obtaining flex point in force value comprises the following steps：(211)：Flex point set in force value is asked for, and force value needs
The condition of satisfaction is simultaneously：The force value is more than former point force value, and latter point force value is less than or equal to the force value, and the force value is big
In minimum yield force threshold values, the force value is less than maximum yield strength threshold values；(212)：If the element of flex point set in force value
Number is more than 0, returns true；If the element number in force value in flex point set is equal to 0, return false.
As shown in figure 5, by taking specific operate as an example, the method that the present invention obtains flex point in force value, step 1 are explained：Ask for
Force value flex point set m_UpInflexion；Force value needs the condition met：The force value is more than former point force value, latter point power
Value is less than or equal to the force value, and the force value is more than minimum yield force threshold values, and the force value is less than maximum yield strength threshold values；Step
2：If the element number of m_UpInflexion set is more than 0, return true；If the element in m_UpInflexion set
Number is equal to 0, returns false.
The method for obtaining yield force index in matched curve comprises the following steps：(231)：Fitting force value sequence is obtained, is taken
The average value of the force value and front and rear each 10 points is fitting force value；(232)：Obtain first in fitting force value arrangement set
Upper flex point indexes iIndex, and uses the method for obtaining flex point in force value；(233)：On first that if step (232) is obtained
Flex point index iIndex is sky, and function returns false；Distance is obtained in force value sequence and is fitted in force value sequence flex point on first
Index the index iUpIndex in iIndex；(234)：Function returns true.
As shown in fig. 6, by taking specific operate as an example, the method that the present invention obtains yield force index in matched curve is explained,
Step 1：Obtain fitting force value sequence lTempforce；Being fitted force value computational methods is：The force value and front and rear each 10 points
Average value；Step 2：The first upper flex point obtained using GetUpInflexion methods in lTempforce set is indexed
iIndex；Step 3：If the iIndex that step 2 is obtained is sky, function returns false；Distance is obtained in force value sequence
Index iUpIndex in lTempforce in iIndex；Step 4：Function returns true.
The method for obtaining flex point under force value comprises the following steps：(251)：Ask for flex point set under force value；Force value needs same
When the condition that meets be：The force value is less than or equal to former point force value, and latter point force value is more than the force value, and the force value is more than
Minimum yield force threshold values, the force value are less than maximum yield strength threshold values；(252)：If the element number of flex point set under force value
More than 0, return true；If the element number in force value in flex point set is equal to 0, return false.
As shown in figure 9, by taking specific operate as an example, the method that the present invention obtains flex point under force value, step 1 are explained：Ask for
Force value flex point set m_DownInflexion；Force value needs the condition met：The force value is less than or equal to former point force value, after
Some force value are more than the force value, and the force value is more than minimum yield force threshold values, and the force value is less than maximum yield strength threshold values；Step
Rapid 2：If the element number of m_DownInflexion set is more than 0, return true；If the member in m_UpInflexion set
Plain number is equal to 0, returns false.
The method for obtaining lower yield force comprises the following steps：(261)：If the number of element is in flex point set under force value
0, function returns false；(262)：Under force value in flex point set, minimum force value after input parameter is asked for；(263)：Function returns
Hui Zhen.
As shown in Figure 10, by taking specific operate as an example, the method that the present invention obtains lower yield force, step 1 are explained：If m_
The number of element is 0 in DownInflexion set, and function returns false；Step 2：In lower flex point set m_DownInflexion
In, ask for minimum force value after input parameter iIndex；Step 3：Function returns true.
Preferably, also comprise the following steps between step (3) and step (4)：(6)：Force use value-Displacement Sequence determines to bend
Take power；(7)：If the result that step (6) returns is true, operating procedure (5)；If the result that step (6) returns is false,
Operating procedure (4).The step (6) and step (7) of the present invention can be without using being another embodiment of the present invention.
Further, force use value-Displacement Sequence determines that the method for yield force comprises the following steps in step (6)：(61)：Such as
The number of element is 0 in fruit Displacement Sequence, or fixture displacement is less than 0, and function returns false；(62)：Calculate fixture displacement
Value foffset02 corresponding to 0.2%；(63)：Calculated using GetMinDistance methods in Displacement Sequence apart from step (62)
Index iIndex02 of the value nearest foffset02 that calculates in Displacement Sequence；(64)：Use GetMinDistance side
Method calculates index of the value nearest apart from the value of maximum, force m_Maxforce*1/2 in force value sequence in force value sequence
iMaxIndex50；(65)：The maximum, force m_Maxforce*1/ in force value sequence is calculated using GetMinDistance methods
Index iMaxIndex10 of the nearest value of 10 value in force value sequence；(66)：Plastic property of reinforcement rebar in force-displacement curve is obtained to become
The slope of shape；Its calculation procedure is：Index iMaxIndex50 is obtained first with indexing poor v1s of the iMaxIndex10 to stress value；
The poor v2 of index iMaxIndex50 displacements corresponding with indexing iMaxIndex10, slope=v1/v2 are obtained again；(67)：Use
GetCloseSlopeIndex methods are obtained in force-displacement curve, after iIndex02 is indexed, force value and index iIndex02
Index iYieldIndex of the point of the slope distance minimum of displacement in force value sequence；(68)：Upper and lower yield force index takes step
Suddenly the index iYieldIndex obtained in (67)；(69)：Function returns true.
As shown in figure 3, by taking specific operate as an example, explain that force use value of the present invention-Displacement Sequence calculates the side of yield force
Method, step 1：If the number of element is 0 in Displacement Sequence, or fixture displacement is less than 0, and function returns false；Step 2：Calculate
Value foffset02 corresponding to the 0.2% of fixture displacement；Step 3：Displacement Sequence middle-range is calculated using GetMinDistance methods
Index iIndex02 of the value nearest from the foffset02 that step calculates in Displacement Sequence；Step 4：Use
GetMinDistance methods calculate in force value sequence the nearest value of maximum, force m_Maxforce*1/2 value in force value sequence
Index iMaxIndex50 in row；Step 5：The maximum, force m_ in force value sequence is calculated using GetMinDistance methods
Index iMaxIndex10 of the nearest value of Maxforce*1/10 value in force value sequence；Step 6：Obtain force-displacement curve
The slope fslope of middle plastic property of reinforcement rebar deformation；Poor v1s of the iMaxIndex50 and iMaxIndex10 to stress value is obtained first, then
Obtain the poor v2, fslope=v1/v2 of iMaxIndex50 displacements corresponding with iMaxIndex10；Step 7：Use
GetCloseSlopeIndex methods are obtained in force-displacement curve, after iIndex02 is indexed, force value and iIndex02 displacements
Index iYieldIndex of the minimum point of slope distance in force value sequence；Step 8：Upper and lower yield force index takes step 7
In the iYieldIndex that obtains；Step 9：Function returns true.
As shown in figure 11, the present invention is obtained in force value sequence apart from some force value apart from minimum force value GetMinDistance
Method comprises the following steps：Step 1：Calculate first force value point and the distance of the force value is stored in fTemp；Step 2：If
Next point exceeds the capacity of force value sequence, then performs step 4.Otherwise, next point and the force value in computing power value sequence
Distance fTemtpo；Step 3：Compare fTemtpo and fTemp size, if fTemtpo is less than fTemp, give fTemp assignment
fTemtpo；Step 4：Function returns.
As shown in figure 12, the present invention obtains slope and indexes GetCloseSlopeIndex methods closest to the force value of some value
Comprise the following steps：Step 1：It is that 6000 distances are stored in fMinTemp that target slopes fslope, which is calculated, with force value；Step 2：
If next point exceeds the capacity of force value sequence, step 4 is performed；Otherwise, (displacement difference refers to the power to calculating force value with displacement difference
The difference of shift value and the corresponding shift values of index02 in Displacement Sequence corresponding to value) ratio, be as a result stored in fvalue；Step
Rapid 3：Calculate fvalue and target slopes fslope distance, and by the distance compared with fMinTemp, if the distance than
FMinTemp is small, then gives fMinTemp assignment the distance；Step 4：Function returns.
Further, the method for force use value rate of change calculating yield force comprises the following steps in step (4)：(41)：From power
The yield force section for meeting threshold values above and below surrender is obtained in value sequence；The value in yield force section fall minimum yield force threshold values with most
Between big yield force threshold values；(42)：If element number is 1 in yield force section, upper and lower yield force takes the value of the element；Such as
Element number is 2 in fruit yield force section, and upper and lower yield force takes the value of last element of yield force section；Function returns；
(43)：Ask for the set of slope in yield force set；The computational methods of slope are：The latter element is taken in yield force section with before
The difference of one element；(44)：Ask for the set of slope variation rate in yield force set of slopes；The computational methods of slope variation rate
For：Take the difference of the latter element and previous element in yield force section；(45)：Ask in yield force slope variation rate most
It is worth the index iYieldIndex in force value sequence greatly；(46)：Upper and lower yield force index takes index iYieldIndex；
(47)：Function returns.
As shown in figure 4, by taking specific operate as an example, the method that force use value rate of change of the present invention calculates yield force is explained,
Step 1：The yield force section lTempforce for meeting threshold values above and below surrender is obtained from force value sequence.The value in yield force section falls
Between minimum yield force threshold values and maximum yield strength threshold values；Step 2：If element number is 1 in lTempforce, bend up and down
Take the value that power takes the element；If in lTempforce element number be 2, upper and lower yield force take lTempforce last
The value of individual element；Function returns；Step 3：Ask for the set lTempSlope of slope in yield force set；The computational methods of slope
For：The difference of the latter element and previous element in lTempforce；Step 4：Slope in yield force set of slopes is asked for become
The set lTempSlopeChange of rate；The computational methods of slope variation rate are：The latter element is with before in lTempforce
The difference of one element；Step 5：Ask for ropes of the maximum fMaxValue in yield force slope variation rate in force value sequence
Draw iYieldIndex；Step 6：Upper and lower yield force index takes iYieldIndex；Step 7：Function returns.
As shown in fig. 7, force value GetFitValue methods comprise the following steps after the present invention obtains fitting：Step 1：Ask for
The summation of the force value and front and rear each 10 force value in original force value sequence lforce；Step 2：Ask for the average value of step 1 result；
Step 3：Function returns.
As shown in figure 8, the present invention, which obtains yield force GetFitUpInflexion methods in matched curve, includes following step
Suddenly：Step 1：Judge whether the force value in the matched curve is legal upper flex point；The force value of upper flex point is bigger than a upper force value,
No more than the latter force value, and the value in corresponding original force value sequence lforce is more than minimum yield force threshold values, less than most
Big yield force threshold values；Step 2：If step 1 is true, function returns true；If step 1 returns to vacation, if exceeding matched curve
Capacity, perform step 3；Otherwise, continue to calculate the force value point in next matched curve, perform step 1；Step 3：Function returns
Return vacation.
Compared with prior art, the invention has the advantages that：
(1) reinforcement yielding power is calculated using the present invention, avoids fixture, testing machine observing and controlling link, testing crew theoretical water
The influence of equality many factors, so as to avoid error, result of calculation is accurate.
(2) during testing, it is not necessary to using extensometer, and can be without using displacement transducer；
(3) influence of sawtooth point and clamp process is effectively removed；
(4) it is used in the steel bar test of any material.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
God any modification, equivalent substitution and improvements made etc., should be included in the scope of the protection with principle.
Claims (6)
1. a kind of computational methods of reinforcement yielding power, it is characterised in that comprise the following steps：
(1)：Input parameter is pre-processed, obtains maximum, force, minimum yield force threshold values, maximum yield strength threshold values, force value sequence
Row and Displacement Sequence；The input parameter includes original force value sequence, original Displacement Sequence and fixture displacement；
The pretreatment comprises the following steps：
(11) be stored in respectively after the negative value in original force value sequence, original Displacement Sequence is deleted new force value sequence,
Displacement Sequence；
(12) minimum yield force threshold values is the 55% of maximum, force, and maximum yield strength threshold values is the 99% of maximum, force；
(2)：Force use value-time series determines yield force, specifically includes：
(21)：Flex point set on surrender section, the upper flex point indexed set that will be obtained are obtained using the method for obtaining flex point in force value
Flex point set chained list in force value is put in conjunction into；
(22)：If the number of element is 0 in flex point set in force value, function returns to vacation, if first in flex point set in force value
The number of element is more than 0 and enters step (23)；
(23)：Application method obtains the upper yield force index after force value sequence fit；
(24)：If step (23) returns to vacation, upper yield force index takes first upper flex point index value in step (22)；If step
Suddenly (23) return true, and upper yield force index takes the return value of function；
(25)：Application method asks for flex point set under force value sequence, puts the lower flex point obtained index set under force value flex point
Gather chained list；
(26)：If the number of element is 0 in flex point set under force value, lower yield force index takes yield force index value, enters
Step (28)；If the number of element is more than 0 in flex point set under force value, application method obtains lower yield force index value, enters
Step (27)；
(27)：If the method for obtaining lower yield force index value returns to vacation, lower yield force index takes yield force index value；If
The method for obtaining lower yield force index value returns very, and lower yield force index takes function return value；
(28)：If upper surrender force value is less than lower surrender force value, lower yield force index modification is the in flex point set under force value
One value；
(29)：Function returns true；
(3)：If the result that step (2) returns is true, operating procedure (5)；If the result that step (2) returns is false,
Operation is in next step；
(4)：Force use value rate of change calculates yield force；
(5)：Yield force and lower yield force in output.
2. the computational methods of reinforcement yielding power as claimed in claim 1, it is characterised in that obtain the method bag of flex point in force value
Include following steps：
(211)：Flex point set in force value is asked for, and the condition that force value needs to meet simultaneously is：The force value is more than former point power
Value, latter point force value are less than or equal to the force value, and the force value is more than minimum yield force threshold values, and the force value is less than maximum surrender
Power threshold values；
(212)：If the element number of flex point set is more than 0 in force value, return true；If the element in force value in flex point set
Number is equal to 0, returns false.
3. the computational methods of reinforcement yielding power as claimed in claim 2, it is characterised in that obtain yield force rope in matched curve
The method drawn comprises the following steps：
(231)：Fitting force value sequence is obtained, the average value for taking the force value and front and rear each 10 points is fitting force value；
(232)：First upper flex point index iIndex in fitting force value arrangement set is obtained, and uses and obtains flex point in force value
Method；
(233)：If first upper flex point index iIndex that step (232) is obtained is sky, function returns false；In force value sequence
The middle index iUpIndex obtained in distance fitting force value sequence in first upper flex point index iIndex；
(234)：Function returns true.
4. the computational methods of reinforcement yielding power as claimed in claim 3, it is characterised in that obtain the method bag of flex point under force value
Include following steps：
(251)：Ask for flex point set under force value；Force value needs while the condition of satisfaction is：The force value is less than or equal to former point
Force value, latter point force value are more than the force value, and the force value is more than minimum yield force threshold values, and the force value is less than maximum yield strength
Threshold values；
(252)：If the element number of flex point set is more than 0 under force value, return true；If the element in force value in flex point set
Number is equal to 0, returns false.
5. the computational methods of reinforcement yielding power as claimed in claim 4, it is characterised in that obtaining the method for lower yield force includes
Following steps：
(261)：If the number of element is 0 in flex point set under force value, function returns false；
(262)：Under force value in flex point set, minimum force value after input parameter is asked for；
(263)：Function returns true.
6. the computational methods of the reinforcement yielding power as any one of claim 1-5, it is characterised in that step (3) and step
Suddenly also comprise the following steps between (4)：
(6)：Force use value-Displacement Sequence determines yield force；
(7)：If the result that step (6) returns is true, operating procedure (5)；If the result that step (6) returns is false,
Operating procedure (4).
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| CN102644033A (en) * | 2012-04-17 | 2012-08-22 | 中国铁道科学研究院金属及化学研究所 | Axle steel used for railway vehicle and preparation method for axle steel |
| CN104018059A (en) * | 2014-06-25 | 2014-09-03 | 武汉钢铁(集团)公司 | Bainite finished deformed bar with yield strength greater than or equal to 980MPa and production method thereof |
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| CN102644033A (en) * | 2012-04-17 | 2012-08-22 | 中国铁道科学研究院金属及化学研究所 | Axle steel used for railway vehicle and preparation method for axle steel |
| CN104018059A (en) * | 2014-06-25 | 2014-09-03 | 武汉钢铁(集团)公司 | Bainite finished deformed bar with yield strength greater than or equal to 980MPa and production method thereof |
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