CN106442298B - Metal component stress corrosion simulator and method in a kind of natural sunning test - Google Patents
Metal component stress corrosion simulator and method in a kind of natural sunning test Download PDFInfo
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Abstract
Metal component stress corrosion simulator carries out speeding-up simulation to residual stress corrosion caused by instantaneous maximum stress with counterweight in a kind of natural sunning test disclosed by the embodiments of the present invention, speeding-up simulation is carried out to stress corrosion caused by dead load under site environment with tension spring, and it is pre-calculated parameter required for simulation test by way of preliminary experiment, realizes the simulation of stress corrosion in natural sunning test.Present invention method is used to simulate the stress corrosion of metal component, solves the technical issues of stress corrosion can not be simulated in existing natural sunning test.
Description
Technical field
The present invention relates to metal component stress corrosions in natural sunning test field more particularly to a kind of natural sunning test
Simulator and method.
Background technique
Usual material use will be by live heavy natural sunning accelerated test, to investigate the corrosion resisting property of material.Material
Corrosion resisting property include chemical attack, electrochemical corrosion, stress corrosion etc..
Wherein, stress corrosion is the material damage that the strain as caused by remaining or applied stress and corrosion synergy generate
Process.The mechanism of common stress corrosion is: under stress and corrosive medium effect, the oxidation film on surface is corroded for part or component
And destroyed, the surface of destruction and unbroken surface are respectively formed anode and cathode, the metal at anode become ion and
It is dissolved, generates current direction cathode.Since annode area is more much smaller than cathode, the current density of anode is very big, further
Corrode the surface of destroyed.In addition the effect of tensile stress, crackle is gradually formed at destruction, crackle is gradually extended at any time until disconnected
It splits.This crackle can not only develop along metal grain boundary, but also can also pass through crystal grain and develop.
Outdoor heavy natural sunning accelerated test is also known as atmosphere accelerated aging test.Need to sample to be tested be placed in heavy natural sunning
Under environment, its performance change is measured after carrying out certain time test.
However existing natural sunning test is static state, mostly investigates the environmental corrosion situation of material, can not investigate material
Stress corrosion.Therefore it proposes a kind of metal component stress corrosion analogy method, simulates corrosion of the stress to metal component, solve
The technical issues of stress corrosion can not be simulated in existing natural sunning test is the difficulty that those skilled in the art need to overcome
It closes.
Summary of the invention
The embodiment of the invention discloses metal component stress corrosion simulator and methods in a kind of natural sunning test, use
In the stress corrosion of simulation metal component, solves the technical issues of stress corrosion can not be simulated in existing natural sunning test.
The embodiment of the invention provides metal component stress corrosion simulators in a kind of natural sunning test, including sample
Frame, metal component sample to be selected, secondary spring, tension spring, counterweight；
The metal component sample to be selected is fixed in the sample frame；
The secondary spring connects the metal component sample to be selected along the vertical direction；
The counterweight is hung on the secondary spring；
One end of the tension spring connects the metal component sample to be selected, and the other end is fixed；
Wherein, the metal component sample to be selected is placed along preset stress direction m and horizontal plane, along the stress
The secondary spring of direction m setting connects the metal component sample to be selected, along the pulling force of preset static stress direction a setting
Spring connects the metal component sample to be selected, the quantity of the counterweight loaded below the secondary spring with according to budget
It loads counterweight weight and preset placement frequency is corresponding, the positional relationship of the fixed tension spring and the tension spring of budget
Elongation is corresponding, and record generates the stress corrosion fracture time.
Preferably, the wink being subject to is simulated in the direction and the metal component sample to be selected of the secondary spring and the counterweight
Residual stress direction after Shi Yingli is identical, and the direction of the tension spring is subject to the metal component sample simulation to be selected
Static stress direction is identical.
The embodiment of the present invention provides metal component stress corrosion analogy method in a kind of natural sunning test, by above-mentioned
Stress corrosion simulator is simulated, comprising:
Metal component sample to be selected is placed along preset stress direction m and horizontal plane, is fixed on and is placed on nature
In sample frame in exposure environment；
The metal component sample to be selected is connected along stress direction m setting secondary spring, along preset static stress side
The metal component sample to be selected is connected to a setting tension spring；
Corresponding answer is loaded below the secondary spring according to the load counterweight weight of budget and preset placement frequency
Power counterweight, the fixed tension spring of tension spring elongation adjustment according to budget.
Preferably, the calculation method of the load counterweight weight are as follows:
Accelerated ratio n is tested at selection scene naturally, and calculating is σ x=σ m+ (2n- along the loading stress size of stress direction m
1) (σ p- σ m)/2n, wherein σ m is the instantaneous maximum tensile stress size that the sample is born, and σ p is ultimate tensile stress；
Load counterweight weight Gm=σ is calculated by the loading stress size σ x and stress corrosion interfacial area Sm of premeasuring
x*Sm/g。
Preferably, the calculation method of the spring elongation are as follows:
Tension spring loading force σ y=σ a+ (2n-1) (Ka- σ a)/2n is calculated, wherein σ a is quiet answering of being subject to of the sample
Power size, n are that nature tests accelerated ratio, and Ka is threshold fracture stress intensity factor；
Loading spring pulling force σ y* is calculated by the tension spring loading force σ y and stress corrosion sectional area Sa of premeasuring
Sa。
Preferably, the ultimate tensile stress σ p is obtained by preliminary experiment one, and the preliminary experiment one specifically includes:
The metal component sample to be selected carries out tension test along the stress direction m, stress strain curve is drawn, from curve
Middle to obtain the ultimate tensile stress σ p, the ultimate tensile stress σ p is that stress and strain is directly proportional during the tensile test
The maximum stress of relationship.
Preferably, the threshold fracture stress intensity factor Ka is obtained by preliminary experiment two, and the preliminary experiment two specifically includes:
The metal component sample to be selected carries out stress corrosion (cracking) test along static stress direction a, draws time t's and load σ
Curve graph determines that threshold fracture stress intensity factor Ka, the threshold fracture stress intensity factor Ka start for the time in curve
Influence the critical value of stress intensity factor variation.
Preferably, before the stress corrosion analogy method further include:
Analyzing static stress direction a and the static stress size that it is subject to according to the specific application environment of the sample is σ a, institute
It is m by instantaneous direction of maximal stress is born, instantaneous maximum stress size is σ m, and the instantaneous maximum stress frequency of occurrences is f.
Preferably, the stress corrosion includes rotten caused by corrosion caused by simulation static stress effect and residual stress effect
Erosion.
Preferably, after the stress corrosion analogy method further include:
Metal component sample to be selected placement after the loading stress is subjected to field test in a natural environment, is recorded
The stress corrosion fracture time is generated, so that the finally metal component according to practical application in rupture time length selection engineering
Material.
As can be seen from the above technical solutions, the embodiment of the present invention has the advantage that
Metal component stress corrosion simulator in a kind of natural sunning test provided in an embodiment of the present invention, with counterweight
Speeding-up simulation is carried out to residual stress corrosion caused by instantaneous maximum stress, dead load under site environment is drawn with tension spring
The stress corrosion risen carries out speeding-up simulation, and parameter required for simulation test is pre-calculated by way of preliminary experiment,
Realize the simulation of stress corrosion in natural sunning test.In addition, present invention method can also be according to the simulation of stress corrosion
As a result selection is carried out to metallic material in engineering.The embodiment of the invention discloses a kind of metal component stress corrosion simulations to fill
It sets and method, for simulating the stress corrosion of metal component, stress corrosion can not be simulated by solving in existing natural sunning test
The technical issues of.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention without any creative labor, may be used also for those of ordinary skill in the art
To obtain other attached drawings according to these attached drawings.
Fig. 1 is a kind of structural schematic diagram of metal component stress corrosion simulator provided in an embodiment of the present invention；
Fig. 2 is a kind of flow chart of metal component stress corrosion analogy method provided in an embodiment of the present invention；
Fig. 3 is that load counterweight weight calculates in a kind of metal component stress corrosion analogy method provided in an embodiment of the present invention
The flow chart of method；
Fig. 4 is spring lengthening variable side in a kind of metal component stress corrosion analogy method provided in an embodiment of the present invention
The flow chart of method；
Fig. 5 is a kind of flow chart for metal component stress corrosion analogy method that another embodiment of the present invention provides；
Fig. 6 is a kind of flow chart for metal component stress corrosion analogy method that another embodiment of the present invention provides.
Wherein, shown under appended drawing reference figure:
1, sample frame；2, metal component sample to be selected；3, counterweight；4, tension spring.
Specific embodiment
Metal component stress corrosion simulator in a kind of natural sunning test provided in an embodiment of the present invention, with counterweight
Speeding-up simulation is carried out to residual stress corrosion caused by instantaneous maximum stress, dead load under site environment is drawn with tension spring
The stress corrosion risen carries out speeding-up simulation, and parameter required for simulation test is pre-calculated by way of preliminary experiment,
Realize the simulation of stress corrosion in natural sunning test.The embodiment of the invention discloses metal components in a kind of natural sunning test
Stress corrosion simulator and method solve nothing in existing natural sunning test for simulating the stress corrosion of metal component
Method simulates the technical issues of stress corrosion.
In order to make the invention's purpose, features and advantages of the invention more obvious and easy to understand, below in conjunction with the present invention
Attached drawing in embodiment, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that disclosed below
Embodiment be only a part of the embodiment of the present invention, and not all embodiment.Based on the embodiments of the present invention, this field
Those of ordinary skill's all other embodiment obtained without making creative work, belongs to protection of the present invention
Range.
Referring to Fig. 1, the embodiment of the invention provides metal component stress corrosion simulation dresses in a kind of natural sunning test
It sets, including sample frame 1, metal component sample 2 to be selected, secondary spring, tension spring 4, counterweight 3；
Metal component sample 2 to be selected is fixed in sample frame 1；
Secondary spring connects metal component sample 2 to be selected along the vertical direction；
Counterweight 3 is hung on secondary spring；
One end of tension spring 4 connects metal component sample 2 to be selected, and the other end is fixed；
Wherein, metal component sample 2 to be selected is placed along preset stress direction m and horizontal plane, is set along stress direction m
The secondary spring set connects metal component sample 2 to be selected, connects along the tension spring 4 of preset static stress direction a setting to be selected
Metal component sample 2, the quantity of counterweight 3 loaded below secondary spring and 3 weight of load counterweight according to budget and preset
Placement frequency is corresponding, and the positional relationship of fixed tension spring 4 is corresponding with 4 elongation of tension spring of budget, and record generates
The stress corrosion fracture time.
Remnants after the instantaneous stress that the direction of secondary spring and counterweight 3 is subject to metal component sample 2 to be selected simulation are answered
Power direction is identical, and the direction of tension spring 4 is identical as the static stress direction that metal component sample 2 to be selected simulation is subject to.
It is to metal component stress corrosion simulator in a kind of natural sunning test provided in an embodiment of the present invention above
It is described in detail, it below will be to metal component stress corrosion mould in a kind of natural sunning test provided in an embodiment of the present invention
Quasi- method is described in detail.
Referring to Fig. 2, the embodiment of the present invention provides metal component stress corrosion analogy method in a kind of natural sunning test,
It is simulated by above-mentioned stress corrosion simulator, comprising:
101, metal component sample to be selected is placed along preset stress direction m and horizontal plane, is fixed on and is placed on
In sample frame in heavy natural sunning environment；
102, metal component sample to be selected is connected along stress direction m setting secondary spring, is set along preset static stress direction a
It sets tension spring and connects metal component sample to be selected；
103, corresponding answer is loaded below secondary spring according to the load counterweight weight of budget and preset placement frequency
Power counterweight, the tension spring elongation according to budget adjust fixed tension spring.
Referring to Fig. 3, the calculation method of load 3 weight of counterweight are as follows:
201, accelerated ratio n is tested at selection scene naturally, and calculating is σ x=σ m+ along the loading stress size of stress direction m
(2n-1) (σ p- σ m)/2n, wherein σ m is the instantaneous maximum tensile stress size that sample is born, and σ p is ultimate tensile stress；
202, load counterweight weight Gm=σ is calculated by the loading stress size σ x and stress corrosion interfacial area Sm of premeasuring
x*Sm/g。
Referring to Fig. 4, the calculation method of tension spring elongation are as follows:
301, tension spring loading force σ y=σ a+ (2n-1) (Ka- σ a)/2n is calculated, wherein σ a is quiet answering of being subject to of sample
Power size, n are that nature tests accelerated ratio, and Ka is threshold fracture stress intensity factor；
302, loading spring pulling force σ y* is calculated by the tension spring loading force σ y and stress corrosion sectional area Sa of premeasuring
Sa。
Ultimate tensile stress σ p is obtained by preliminary experiment one, and preliminary experiment one specifically includes:
Metal component sample 2 to be selected carries out tension test along stress direction m, draws stress strain curve, obtains from curve
Ultimate tensile stress σ p, ultimate tensile stress σ p are that the proportional maximum of stress and strain is answered during the tensile test
Power.
Threshold fracture stress intensity factor Ka is obtained by preliminary experiment two, and preliminary experiment two specifically includes:
Metal component sample 2 to be selected carries out stress corrosion (cracking) test along static stress direction a, draws the curve of time t and load σ
Figure determines that threshold fracture stress intensity factor Ka, threshold fracture stress intensity factor Ka started to influence stress for the time in curve
The critical value of intensity factor variation.
Before stress corrosion analogy method provided in an embodiment of the present invention further include:
Analyzing static stress direction a and the static stress size that it is subject to according to the specific application environment of sample is σ a, suffered to hold
It is m by instantaneous direction of maximal stress, instantaneous maximum stress size is σ m, and the instantaneous maximum stress frequency of occurrences is f.
Stress corrosion includes corrosion caused by corrosion caused by simulation static stress effect and residual stress effect.
After stress corrosion analogy method provided in an embodiment of the present invention further include:
Metal component sample 2 to be selected placement after loading stress is subjected to field test in a natural environment, record produces
The raw stress corrosion fracture time, so that the final metal component material according to practical application in rupture time length selection engineering.
It is that metal component stress corrosion simulator provided in an embodiment of the present invention is described in detail above, below
Metal component stress corrosion analogy method in a kind of natural sunning test provided another embodiment of the present invention is carried out detailed
Thin description.
Referring to Fig. 5, metal component is answered in a kind of natural sunning test that another embodiment of the embodiment of the present invention provides
Power corrosion simulation method includes:
401, analysis need to carry out the outdoor sample stress condition being exposed to the sun, and be exposed to the sun the analysis of sample specific application environment according to open air
All static stress direction a being subject to of its sample and static stress size are σ a, and the suffered instantaneous direction of maximal stress of receiving is m, stress
Size is σ m, and the instantaneous maximum stress frequency of occurrences is f；
402, selection pre-program metal component carries out laboratory tension test, answers along test metal component in instantaneous maximum
Carry out tension test on the m of power direction, draw stress strain curve, record proportional limit stress σ p, is i.e. stress during the tensile test
The proportional maximum stress with strain.
403, pre-program metal component is selected, laboratory stress corrosion (cracking) test is carried out along static stress direction a, draws the time
The curve graph of t and load σ determine threshold fracture stress intensity factor Ka, i.e., the time starts to influence stress intensity factor in curve
The critical value of variation.
404, metallic material components sample to be selected is placed in sample frame, along stress direction m loading stress counterweight, tool
Body mode is to hang metal component to be measured with horizontal plane mode along suffered stress direction m using fixture shown in attached drawing and put
It sets, in the direction a loading tensile spring.
405, accelerated ratio n is tested at selection scene naturally, and then determines loading stress size in field test.Simulation is instantaneous
Residual stress corrosion after maximum stress effect, used spring suspension counterweight mode loading stress size is σ x=σ m+ (2n-
1) (σ p- σ m)/2n calculates load counterweight weight Gm=σ x*Sm/g, selects according to frequency f especially by stress corrosion interfacial area Sm
Select the frequency for placing counterweight.
406, extension spring is loaded along static stress direction a to metallic material components to be selected described in step 404, simulates static stress
Stress corrosion under effect, extension spring loading force σ y=σ a+ (2n-1) (Ka- σ a)/2n, especially by stress corrosion sectional area
Sa calculates loading spring pulling force σ y*Sa, and the elongation l for selecting spring under the pulling force is tested by tensiometer, is by elongation
In the fixed metal component of the spring of l and sample frame.
407, nature is placed on to the metal component material to be selected described in step 405 and step 406 after loading stress
Field test is carried out under environment.Record generates the stress corrosion fracture time, selects actually to answer in engineering according to rupture time length
Metal component material.
It should be noted that the embodiment of the present invention simulates stress corrosion situation with constant load method and varying load method jointly.
The working stress or machining stress that constant load method may be subject in model engineering component have more apparent advantage.With other
Test method is compared to more stringent, and the sample service life is shorter, and the limit stress of stress corrosion cracking is lower.Comparable different materials exist
The superiority and inferiority of anti-stress corrosion performance in the medium, is applicable in the sample of different type and size, and different stress methods can be used, and fits
For simulating stress corrosion caused by static stress.Residual stress after metal component is acted on by instantaneous stress is simulated by varying load method
Caused stress corrosion, by under constant load and varying load method collective effect, stress corrosion suffered by comprehensive simulation metal component.
The embodiment of the present invention accelerates field test by laboratory tension test and stress corrosion (cracking) test result.
Carry out open field test, need to select appropriate magnitude of load simulation stress corrosion, is guaranteeing that the scene of simulating is practical natural
Under the premise of environment and application environment, the stress corrosion simulation of metal component is accelerated.Pass through laboratory tension test knot
Fruit calculates instantaneous maximum stress, carries out speeding-up simulation to residual stress corrosion caused by instantaneous maximum stress；Pass through laboratory perseverance
Loading stress corrosion test result calculates dead load, carries out speeding-up simulation to stress corrosion caused by dead load under site environment.
It is metal component stress corrosion mould in a kind of natural sunning test provided another embodiment of the present invention above
The detailed description of quasi- method, does detailed retouch for the stress corrosion analogy method provided another embodiment of the present invention below
It states.
Referring to Fig. 6, the stress corrosion analogy method that another embodiment of the present invention provides includes:
501, it is as follows to obtain metal component material each parameter in engineer application: static stress direction a that component is subject to and quiet
Stress intensity σ a, instantaneous direction of maximal stress m, stress intensity σ m, instantaneous maximum stress frequency of occurrences f；
502, the parameter that stress corrosion is simulated in live natural sunning test, along test metal component in instantaneous maximum stress
Carry out tension test on the m of direction, draw stress strain curve, records proportional limit stress σ p.；
503, laboratory stress corrosion (cracking) test is carried out along static stress direction a, draws the curve graph of time t and load σ, determined
Threshold fracture stress intensity factor Ka；
504, accelerated ratio n is tested at selection scene naturally, and the residual stress corrosion after simulating instantaneous maximum stress effect is adopted
It is σ x=σ m+ (2n-1) (σ p- σ m)/2n with spring suspension counterweight mode loading stress size, especially by stress corrosion interface
Product Sm calculates load counterweight weight Gm=σ x*Sm/g
505, the stress corrosion under the effect of simulation static stress, extension spring loading force σ y=σ a+ (2n-1) (Ka- σ a)/2n,
Especially by stress corrosion sectional area Sa, loading spring pulling force σ y*Sa is calculated；
506, the sample that stress corrosion is simulated in live natural sunning test is placed and applies loading stress method: will be to be selected
Metal component sample is fixed in sample frame, and sample is placed along the direction m and horizontal plane, along stress direction m loading stress
Counterweight, in the direction a loading tensile spring.
507, record different metal construction material generates the stress corrosion fracture time, selects engineering according to rupture time length
The metal component material of middle practical application analyzes stress corrosion fracture reason and mechanism.
It should be noted that stress corrosion includes corrosion and remnants caused by simulation static stress effect in the embodiment of the present invention
Two kinds of corrosion caused by stress.
The embodiment of the present invention passes through in laboratory tension test and the live test naturally of stress corrosion (cracking) test structure determination not
With acceleration rate, corresponding accelerated test applies stress intensity, mode and frequency.
The stress that fixed test frame can be realized simultaneously under static stress (tensile stress) effect described in above-mentioned steps 506 is rotten
Residual stress corrosion after erosion and instantaneous stress.
The present invention is conducive to simulate stress corrosion failure conditions in true outdoor environment early period, to outdoor structures metal
Material type selecting is significant.
The above, the above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although referring to before
Stating embodiment, invention is explained in detail, those skilled in the art should understand that: it still can be to preceding
Technical solution documented by each embodiment is stated to modify or equivalent replacement of some of the technical features；And these
It modifies or replaces, the spirit and scope for technical solution of various embodiments of the present invention that it does not separate the essence of the corresponding technical solution.
Claims (10)
1. metal component stress corrosion simulator in a kind of natural sunning test, which is characterized in that including sample frame, to be selected
Metal component sample, secondary spring, tension spring, counterweight；
The metal component sample to be selected is fixed in the sample frame；
The secondary spring connects the metal component sample to be selected along the vertical direction；
The counterweight is hung on the secondary spring；
One end of the tension spring connects the metal component sample to be selected, and the other end is fixed；
Wherein, the metal component sample to be selected is placed along preset stress direction m and horizontal plane, along the stress direction
The secondary spring of m setting connects the metal component sample to be selected, along the tension spring of preset static stress direction a setting
Connect the metal component sample to be selected, quantity and the load according to budget of the counterweight loaded below the secondary spring
Counterweight weight and preset placement frequency are corresponding, and the positional relationship of the fixed tension spring and the tension spring of budget extend
Measure corresponding, the record generation stress corrosion fracture time.
2. a kind of stress corrosion simulator according to claim 1, which is characterized in that the secondary spring and the weight
The direction of code is identical as the residual stress direction after the instantaneous stress that the metal component sample simulation to be selected is subject to, the pulling force
The direction of spring is identical as the static stress direction that the metal component sample simulation to be selected is subject to.
3. metal component stress corrosion analogy method in a kind of natural sunning test, passes through stress as claimed in claim 1 or 2
Corrosion simulated device is simulated characterized by comprising
Metal component sample to be selected is placed along preset stress direction m and horizontal plane, is fixed on and is placed on heavy natural sunning
In sample frame in environment；
The metal component sample to be selected is connected along stress direction m setting secondary spring, is set along preset static stress direction a
It sets tension spring and connects the metal component sample to be selected；
Corresponding stress weight is loaded below the secondary spring according to the load counterweight weight of budget and preset placement frequency
Code, the fixed tension spring of tension spring elongation adjustment according to budget.
4. stress corrosion analogy method according to claim 3, which is characterized in that the calculating side of the load counterweight weight
Method are as follows:
Accelerated ratio n is tested at selection scene naturally, and calculating is σ x=σ m+ (2n-1) (σ along the loading stress size of stress direction m
P- σ m)/2n, wherein σ m is the instantaneous maximum tensile stress size that the sample is born, and σ p is ultimate tensile stress；
Load counterweight weight Gm=σ x* is calculated by the loading stress size σ x and stress corrosion interfacial area Sm of premeasuring
Sm/g。
5. stress corrosion analogy method according to claim 3, which is characterized in that the calculation method of the spring elongation
Are as follows:
Tension spring loading force σ y=σ a+ (2n-1) (Ka- σ a)/2n is calculated, wherein σ a is that the static stress that the sample is subject to is big
Small, n is that nature tests accelerated ratio, and Ka is threshold fracture stress intensity factor；
Loading spring pulling force σ y*Sa is calculated by the tension spring loading force σ y and stress corrosion sectional area Sa of premeasuring.
6. stress corrosion analogy method according to claim 4, which is characterized in that the ultimate tensile stress σ p is by pre- reality
An acquisition is tested, the preliminary experiment one specifically includes:
The metal component sample to be selected carries out tension test along the stress direction m, draws stress strain curve, obtains from curve
The ultimate tensile stress σ p is obtained, the ultimate tensile stress σ p is that stress and strain is proportional during the tensile test
Maximum stress.
7. stress corrosion analogy method according to claim 5, which is characterized in that the threshold fracture stress intensity factor
Ka is obtained by preliminary experiment two, and the preliminary experiment two specifically includes:
The metal component sample to be selected carries out stress corrosion (cracking) test along static stress direction a, draws the curve of time t and load σ
Figure determines that threshold fracture stress intensity factor Ka, the threshold fracture stress intensity factor Ka start to influence for the time in curve
The critical value of stress intensity factor variation.
8. stress corrosion analogy method according to claim 4 or 5, which is characterized in that the stress corrosion analogy method
Before further include:
Analyzing static stress direction a and the static stress size that it is subject to according to the specific application environment of the sample is σ a, suffered to hold
It is m by instantaneous direction of maximal stress, instantaneous maximum stress size is σ m, and the instantaneous maximum stress frequency of occurrences is f.
9. stress corrosion analogy method according to claim 3, which is characterized in that the stress corrosion includes simulating quiet answer
Corrosion caused by corrosion caused by power effect and residual stress effect.
10. stress corrosion analogy method according to claim 3, which is characterized in that the stress corrosion analogy method it
Afterwards further include:
Metal component sample to be selected placement after the loading stress is subjected to field test in a natural environment, record generates
The stress corrosion fracture time, so that the finally metal component material according to practical application in rupture time length selection engineering
Material.
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