CN106442298A - Device and method for simulating stress corrosion of metal component in natural exposure test - Google Patents
Device and method for simulating stress corrosion of metal component in natural exposure test Download PDFInfo
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- CN106442298A CN106442298A CN201610994360.7A CN201610994360A CN106442298A CN 106442298 A CN106442298 A CN 106442298A CN 201610994360 A CN201610994360 A CN 201610994360A CN 106442298 A CN106442298 A CN 106442298A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N17/00—Investigating resistance of materials to the weather, to corrosion, or to light
- G01N17/006—Investigating resistance of materials to the weather, to corrosion, or to light of metals
Abstract
An embodiment of the invention discloses a device for simulating stress corrosion of a metal component in a natural exposure test. Acceleration simulation is performed on residual stress corrosion caused by maximum instantaneous stress through weights and on stress corrosion caused by static load in site environment through tension springs, parameters required for a simulation test are calculated in advance through preliminary experiments, and simulation of stress corrosion in the natural exposure test is realized. A method is used for simulating stress corrosion of the metal component, and the technical problem that simulation of stress corrosion is unavailable in current natural exposure tests is solved.
Description
Technical field
The present invention relates to heavy natural sunning test field, hardware stress corrosion in more particularly, to a kind of heavy natural sunning test
Analogue means and method.
Background technology
Generally material use will investigate the corrosion resisting property of material through live heavy natural sunning accelerated test.Material
Corrosion resisting property include chemical attack, electrochemical corrosion, stress corrosion etc..
Wherein, stress corrosion is the material damage that the strain being led to by remaining or applied stress and corrosion synergy produce
Process.The mechanism of common stress corrosion is：, under stress and corrosive medium act on, the oxide-film on surface is corroded for part or component
And destroyed, the surface of destruction and unbroken surface form anode and negative electrode respectively, the metal at anode become ion and
It is dissolved, produce current direction negative electrode.Because annode area is more much smaller than negative electrode, the current density of anode is very big, further
The surface of corrosion destroyed.Plus the effect of tension, at destruction, gradually form crackle, crackle gradually extends in time until disconnected
Split.This crackle not only can develop along metal grain border, and can also pass through crystal grain development.
Outdoor heavy natural sunning accelerated test is also known as air accelerated aging test.The sample needing test is placed in heavy natural sunning
Under environment, after carrying out certain time test, measure its performance change.
But the test of existing heavy natural sunning is static state, mostly investigate the environmental corrosion situation of material it is impossible to investigate material
Stress corrosion.It is proposed that a kind of hardware stress corrosion analogy method, simulate the corrosion to hardware for the stress, solve
The technical problem that stress corrosion cannot be simulated in existing heavy natural sunning test is the difficulty that those skilled in the art's needs overcome
Close.
Content of the invention
The embodiment of the invention discloses hardware stress corrosion analogue means and method in a kind of test of heavy natural sunning, use
In the stress corrosion of simulation hardware, solve the technical problem that cannot simulate stress corrosion in existing heavy natural sunning test.
Embodiments provide hardware stress corrosion analogue means in a kind of heavy natural sunning test, including sample
Framework, hardware sample to be selected, secondary spring, tension spring, counterweight；
Described hardware sample to be selected is fixed in described sample framework；
Described secondary spring vertically connects described hardware sample to be selected；
Described counterweight hangs on described secondary spring；
One end of described tension spring connects described hardware sample to be selected, and the other end is fixed；
Wherein, described hardware sample to be selected is placed along default stress direction m with horizontal plane, along described stress
The described secondary spring of direction m setting connects described hardware sample to be selected, along the pulling force of default static stress direction a setting
Spring connects described hardware sample to be selected, the quantity of described counterweight of loading and foundation budget below described secondary spring
Loading counterweight weight is corresponding with default placement frequency, fixes the position relationship of described tension spring and the tension spring of budget
Elongation is corresponding, and record produces the stress corrosion fracture time.
Preferably, the wink being subject to is simulated, with described hardware sample to be selected, in described secondary spring and the direction of described counterweight
Residual stress direction after Shi Yingli is identical, and the direction of described tension spring is subject to described hardware sample simulation to be selected
Static stress direction is identical.
The embodiment of the present invention provides hardware stress corrosion analogy method in a kind of heavy natural sunning test, by above-mentioned
Stress corrosion analogue means is simulated, including：
Hardware sample to be selected is placed with horizontal plane along default stress direction m, is fixed on and is placed on nature
In sample framework in exposure environment；
Connect described hardware sample to be selected along described stress direction m setting secondary spring, along default static stress side
Connect described hardware sample to be selected to a setting tension spring；
Loading counterweight weight and default placement frequency according to budget load corresponding answering below described secondary spring
Power counterweight, according to the fixing described tension spring of tension spring elongation adjustment of budget.
Preferably, the computational methods of described loading counterweight weight are：
Scene is selected naturally to test accelerated ratio n, the loading stress size calculating along stress direction m is σ x=σ m+ (2n-
1) (σ p- σ m)/2n, wherein σ m are the instantaneous maximum tensile stress size that described sample bears, and σ p is ultimate tensile stress；
Calculated by stress corrosion interfacial area Sm of described loading stress size σ x and premeasuring and load counterweight weight Gm=σ
x*Sm/g.
Preferably, the computational methods of described spring elongation are：
Calculate tension spring loading force σ y=σ a+ (2n-1) (Ka- σ a)/2n, wherein σ a be described sample be subject to quiet should
Power size, for naturally testing accelerated ratio, Ka is threshold fracture stress intensity factor to n；
Loading spring pulling force σ y* is calculated by the stress corrosion sectional area Sa of described tension spring loading force σ y and premeasuring
Sa.
Preferably, described ultimate tensile stress σ p is obtained by preliminary experiment one, and described preliminary experiment one specifically includes：
Described hardware sample to be selected carries out tension test along along described stress direction m, draws stress strain curve, from curve
The described ultimate tensile stress σ p of middle acquisition, described ultimate tensile stress σ p is that stress and strain is directly proportional during tension test
The maximum stress of relation.
Preferably, described threshold fracture stress intensity factor Ka is obtained by preliminary experiment two, and described preliminary experiment two specifically includes：
Described hardware sample to be selected carries out stress corrosion (cracking) test along static stress direction a, draws time t and load σ
Curve map, determines threshold fracture stress intensity factor Ka, and described threshold fracture stress intensity factor Ka started for the time in curve
The critical value of impact stress intensity factor change.
Preferably, also include before described stress corrosion analogy method：
Its static stress direction a of being subject to of concrete application environmental analysis according to described sample and static stress size are σ a, institute
Being born instantaneous direction of maximal stress is m, and instantaneous maximum stress size is σ m, and the instantaneous maximum stress frequency of occurrences is f.
Preferably, described stress corrosion includes simulating the corruption that the static stress corrosion that causes of effect and residual stress effect cause
Erosion.
Preferably, also include after described stress corrosion analogy method：
Hardware sample to be selected after described loading stress is placed under natural environment and carries out field test, record
Produce the stress corrosion fracture time so that finally select the hardware of practical application in engineering according to described rupture time length
Material.
As can be seen from the above technical solutions, the embodiment of the present invention has advantages below：
Hardware stress corrosion analogue means in a kind of heavy natural sunning test provided in an embodiment of the present invention, with counterweight
Speeding-up simulation is carried out to the residual stress corrosion that instantaneous maximum stress causes, with tension spring, dead load under site environment is drawn
The stress corrosion rising carries out speeding-up simulation, and is pre-calculated the parameter required for simulated test by way of preliminary experiment,
Realize the simulation of stress corrosion in heavy natural sunning test.Additionally, present invention method can also be according to the simulation of stress corrosion
Result carries out selection to metallic material in engineering.The embodiment of the invention discloses a kind of hardware stress corrosion simulation dress
Put and method, for simulating the stress corrosion of hardware, solve in existing heavy natural sunning test and cannot simulate stress corrosion
Technical problem.
Brief description
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
Have technology description in required use accompanying drawing be briefly described it should be apparent that, drawings in the following description be only this
Some embodiments of invention, for those of ordinary skill in the art, without having to pay creative labor, also may be used
So that other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 is a kind of structural representation of hardware stress corrosion analogue means provided in an embodiment of the present invention；
Fig. 2 is a kind of flow chart of hardware stress corrosion analogy method provided in an embodiment of the present invention；
Fig. 3 is to load counterweight weight in a kind of hardware stress corrosion analogy method provided in an embodiment of the present invention to calculate
The flow chart of method；
Fig. 4 is spring lengthening variable side in a kind of hardware stress corrosion analogy method provided in an embodiment of the present invention
The flow chart of method；
A kind of flow chart of hardware stress corrosion analogy method that Fig. 5 provides for another embodiment of the present invention；
A kind of flow chart of hardware stress corrosion analogy method that Fig. 6 provides for another embodiment of the present invention.
Wherein, shown under reference figure：
1st, sample framework；2nd, hardware sample to be selected；3rd, counterweight；4th, tension spring.
Specific embodiment
Hardware stress corrosion analogue means in a kind of heavy natural sunning test provided in an embodiment of the present invention, with counterweight
Speeding-up simulation is carried out to the residual stress corrosion that instantaneous maximum stress causes, with tension spring, dead load under site environment is drawn
The stress corrosion rising carries out speeding-up simulation, and is pre-calculated the parameter required for simulated test by way of preliminary experiment,
Realize the simulation of stress corrosion in heavy natural sunning test.The embodiment of the invention discloses hardware in a kind of heavy natural sunning test
Stress corrosion analogue means and method, for simulating the stress corrosion of hardware, solve in existing heavy natural sunning test no
Method simulates the technical problem of stress corrosion.
For enabling the goal of the invention of the present invention, feature, advantage more obvious and understandable, below in conjunction with the present invention
Accompanying drawing in embodiment, is clearly and completely described it is clear that disclosed below to the technical scheme in the embodiment of the present invention
Embodiment be only a part of embodiment of the present invention, and not all embodiment.Based on the embodiment in the present invention, this area
All other embodiment that those of ordinary skill is obtained under the premise of not making creative work, broadly falls into present invention protection
Scope.
Refer to Fig. 1, embodiments provide hardware stress corrosion simulation dress in a kind of heavy natural sunning test
Put, including sample framework 1, hardware sample 2 to be selected, secondary spring, tension spring 4, counterweight 3；
Hardware sample 2 to be selected is fixed in sample framework 1；
Secondary spring vertically connects hardware sample 2 to be selected；
Counterweight 3 hangs on secondary spring；
One end of tension spring 4 connects hardware sample 2 to be selected, and the other end is fixed；
Wherein, hardware sample 2 to be selected is placed along default stress direction m with horizontal plane, sets along stress direction m
The secondary spring put connects hardware sample 2 to be selected, and the tension spring 4 arranging along default static stress direction a connects to be selected
Hardware sample 2, the quantity of counterweight 3 loading below secondary spring and foundation loading counterweight 3 weight of budget and default
Placement frequency is corresponding, and the position relationship of fixing tension spring 4 is corresponding with tension spring 4 elongation of budget, and record produces
The stress corrosion fracture time.
Secondary spring is simulated the remnants after the instantaneous stress being subject to and is answered with the direction of counterweight 3 and hardware sample 2 to be selected
Force direction is identical, and the static stress direction that the direction of tension spring 4 is subject to hardware sample 2 to be selected simulation is identical.
It is more than to hardware stress corrosion analogue means in a kind of heavy natural sunning test provided in an embodiment of the present invention
It is described in detail, hardware stress corrosion mould in below a kind of heavy natural sunning provided in an embodiment of the present invention being tested
Plan method is described in detail.
Refer to Fig. 2, the embodiment of the present invention provides hardware stress corrosion analogy method in a kind of heavy natural sunning test,
It is simulated by above-mentioned stress corrosion analogue means, including：
101st, hardware sample to be selected is placed along default stress direction m and horizontal plane, be fixed on and be placed on
In sample framework in heavy natural sunning environment；
102nd, connect hardware sample to be selected along stress direction m setting secondary spring, set along default static stress direction a
Put tension spring and connect hardware sample to be selected；
103rd, load corresponding answering below secondary spring according to the loading counterweight weight and default placement frequency of budget
Power counterweight, according to the fixing tension spring of tension spring elongation adjustment of budget.
Refer to Fig. 3, the computational methods loading counterweight 3 weight are：
201st, scene is selected naturally to test accelerated ratio n, the loading stress size calculating along stress direction m is σ x=σ m+
(2n-1) (σ p- σ m)/2n, the instantaneous maximum tensile stress size that wherein σ m bears for sample, σ p is ultimate tensile stress；
202nd, pass through loading stress size σ x and stress corrosion interfacial area Sm of premeasuring calculates loading counterweight weight Gm=σ
x*Sm/g.
Refer to Fig. 4, the computational methods of tension spring elongation are：
301st, calculate tension spring loading force σ y=σ a+ (2n-1) (Ka- σ a)/2n, wherein σ a be sample be subject to quiet answer
Power size, for naturally testing accelerated ratio, Ka is threshold fracture stress intensity factor to n；
302nd, pass through the tension spring loading force σ y and stress corrosion sectional area Sa of premeasuring and calculate loading spring pulling force σ y*
Sa.
Ultimate tensile stress σ p is obtained by preliminary experiment one, and preliminary experiment one specifically includes：
Hardware sample 2 to be selected carries out tension test along 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 should during tension test
Power.
Threshold fracture stress intensity factor Ka is obtained by preliminary experiment two, and preliminary experiment two specifically includes：
Hardware 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 threshold fracture stress intensity factor Ka, and threshold fracture stress intensity factor Ka started to affect stress for the time in curve
The critical value of intensity factor change.
Also include before stress corrosion analogy method provided in an embodiment of the present invention：
Its static stress direction a of being subject to of concrete application environmental analysis according to sample and static stress size are σ a, suffered hold
It is m by instantaneous direction of maximal stress, instantaneous maximum stress size is σ m, the instantaneous maximum stress frequency of occurrences is f.
Stress corrosion includes simulation static stress and acts on the corrosion that the corrosion causing and residual stress effect cause.
Also include after stress corrosion analogy method provided in an embodiment of the present invention：
Hardware sample 2 to be selected after loading stress is placed under natural environment and carries out field test, record produces
The raw stress corrosion fracture time is so that final foundation rupture time length selects the hardware material of practical application in engineering.
It is more than hardware stress corrosion analogue means provided in an embodiment of the present invention to be described in detail, below
Hardware stress corrosion analogy method in a kind of heavy natural sunning test that another embodiment of the present invention is provided is carried out in detail
Thin description.
Refer to Fig. 5, in a kind of heavy natural sunning test that another embodiment of the embodiment of the present invention provides, hardware should
Power corrosion simulation method includes：
401st, analysis need to carry out the sample stressing conditions that are exposed to the sun of open air, is exposed to the sun sample concrete application environmental analysis according to open air
The all static stress direction a being subject to of its sample and static stress size are σ a, and suffered to bear instantaneous direction of maximal stress be m, stress
Size is σ m, and the instantaneous maximum stress frequency of occurrences is f；
402nd, select pre-program hardware to carry out laboratory tension test, answer instantaneously maximum along test hardware
Carry out tension test on force direction m, draw stress strain curve, record proportional limit stress σ p, i.e. stress during tension test
The maximum stress proportional with strain.
403rd, select pre-program hardware, carry out laboratory stress corrosion (cracking) test along static stress direction a, draw the time
T and the curve map of load σ, determine threshold fracture stress intensity factor Ka, and that is, in curve, the time starts to affect stress intensity factor
The critical value of change.
404th, metallic material components sample to be selected is placed in sample framework, along stress direction m loading stress counterweight, has
Body mode is using fixture shown in accompanying drawing, hardware to be measured is hung with horizontal plane mode along suffered stress direction m and puts
Put, in a direction loading tensile spring.
405th, select scene naturally to test accelerated ratio n, and then determine loading stress size in field test.Simulation is instantaneous
Residual stress corrosion after maximum stress effect, it is σ x=σ m+ (2n- that adopted spring hangs counterweight mode loading stress size
1) (σ p- σ m)/2n, especially by stress corrosion interfacial area Sm, calculates and loads counterweight weight Gm=σ x*Sm/g, according to the choosing of frequency f
Select the frequency placing counterweight.
406th, along static stress direction a, extension spring is loaded to metallic material components to be selected described in step 404, simulate 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, selects elongation l under this pulling force for the spring by tensiometer test, elongation is
In the fixing hardware of the spring of l and specimen mounting.
407th, nature is placed on to the hardware material to be selected after loading stress described in step 405 and step 406
Carry out field test under environment.Record produces the stress corrosion fracture time, should according to reality in rupture time length selection engineering
Hardware material.
It should be noted that the embodiment of the present invention uses constant load method and varying load method jointly to simulate stress corrosion situation.
The working stress that constant load method may be subject in model engineering component or machining stress have more apparent advantage.With other
Test method is compared more strict, and the sample life-span is shorter, and the limit stress of stress corrosion cracking is lower.Comparable different materials exist
The quality of anti-stress corrosion performance in this medium, is suitable for dissimilar and size sample, can be fitted using different stress methods
For simulating the stress corrosion that static stress causes.Residual stress after hardware is acted on by instantaneous stress is simulated by varying load method
The stress corrosion leading to, by under constant load and varying load method collective effect, stress corrosion suffered by comprehensive simulation hardware.
The embodiment of the present invention is accelerated to field test by laboratory tension test and stress corrosion (cracking) test result.
Carry out open field test, need to select suitable magnitude of load simulation stress corrosion, ensureing that simulated field is actual natural
On the premise of environment and applied environment, the stress corrosion simulation to hardware accelerates.Tied by laboratory tension test
Fruit calculates instantaneous maximum stress, carries out speeding-up simulation to the residual stress corrosion that instantaneous maximum stress causes；Permanent by laboratory
Loading stress corrosion test result calculates dead load, carries out speeding-up simulation to the stress corrosion that dead load under site environment causes.
It is more than hardware stress corrosion mould in a kind of heavy natural sunning test that another embodiment of the present invention is provided
The stress corrosion analogy method that another embodiment of the present invention is provided is done detailed retouching by the detailed description of plan method below
State.
Refer to Fig. 6, the stress corrosion analogy method that another embodiment of the present invention provides includes：
501st, obtain hardware material each parameter in engineer applied as follows：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；
502nd, simulate the parameter of stress corrosion in live heavy natural sunning test, along test hardware in instantaneous maximum stress
Carry out tension test on the m of direction, draw stress strain curve, record proportional limit stress σ p.；
503rd, carry out laboratory stress corrosion (cracking) test along static stress direction a, draw the curve map of time t and load σ, determine
Threshold fracture stress intensity factor Ka；
504th, select scene naturally to test accelerated ratio n, the residual stress corrosion after simulation instantaneous maximum stress effect, adopt
Hanging counterweight mode loading stress size with spring is σ x=σ m+ (2n-1) (σ p- σ m)/2n, especially by stress corrosion interface
Long-pending Sm, calculates and loads counterweight weight Gm=σ x*Sm/g
505th, 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, calculate loading spring pulling force σ y*Sa；
506th, the sample simulating stress corrosion in live heavy natural sunning test is laid and is applied loading stress method：Will be to be selected
Hardware sample is fixed in sample framework, and sample is placed along m direction with horizontal plane, along stress direction m loading stress
Counterweight, in a direction loading tensile spring.
507th, record different metal construction material produces the stress corrosion fracture time, selects engineering according to rupture time length
The hardware material of middle practical application, analysis stress corrosion fracture reason and mechanism.
It should be noted that stress corrosion includes simulating corrosion and the remnants that static stress effect causes in the embodiment of the present invention
Two kinds of the corrosion that stress causes.
The embodiment of the present invention is passed through in laboratory tension test and the live test naturally of stress corrosion (cracking) test structure determination not
Apply stress intensity, mode and frequency with the corresponding accelerated test of acceleration rate.
The stress that fixation test framework described in above-mentioned steps 506 can be realized under static stress (tension) effect simultaneously is rotten
Residual stress corrosion after erosion and instantaneous stress.
The present invention is conducive to early stage to simulate stress corrosion failure conditions in true outdoor environment, to outdoor structures metal
Material type selecting is significant.
The above, above example only in order to technical scheme to be described, is not intended to limit；Although with reference to front
State embodiment the present invention has been described in detail, it will be understood by those within the art that：It still can be to front
State the technical scheme described in each embodiment to modify, or equivalent is carried out to wherein some technical characteristics；And these
Modification or replacement, do not make the essence of appropriate technical solution depart from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (10)
1. in a kind of test of heavy natural sunning hardware stress corrosion analogue means it is characterised in that including sample framework, to be selected
Hardware sample, secondary spring, tension spring, counterweight；
Described hardware sample to be selected is fixed in described sample framework；
Described secondary spring vertically connects described hardware sample to be selected；
Described counterweight hangs on described secondary spring；
One end of described tension spring connects described hardware sample to be selected, and the other end is fixed；
Wherein, described hardware sample to be selected is placed along default stress direction m with horizontal plane, along described stress direction
The described secondary spring of m setting connects described hardware sample to be selected, along the tension spring of default static stress direction a setting
Connect described hardware sample to be selected, the loading of the quantity of described counterweight loading below described secondary spring and foundation budget
Counterweight weight is corresponding with default placement frequency, and the position relationship of fixing described tension spring is extended with the tension spring of budget
Amount is corresponding, and record produces the stress corrosion fracture time.
2. a kind of stress corrosion analogue means according to claim 1 is it is characterised in that described secondary spring and described weight
The residual stress direction that the direction of code is simulated after the instantaneous stress being subject to described hardware sample to be selected is identical, described pulling force
The static stress direction that the direction of spring is subject to described hardware sample simulation to be selected is identical.
3. hardware stress corrosion analogy method in a kind of heavy natural sunning test, by stress as claimed in claim 1 or 2
Corrosion simulated device is simulated it is characterised in that including：
Hardware sample to be selected is placed with horizontal plane along default stress direction m, is fixed on and is placed on heavy natural sunning
In sample framework in environment；
Connect described hardware sample to be selected along described stress direction m setting secondary spring, set along default static stress direction a
Put tension spring and connect described hardware sample to be selected；
Loading counterweight weight and default placement frequency according to budget load corresponding stress weight below described secondary spring
Code, according to the fixing described tension spring of tension spring elongation adjustment of budget.
4. stress corrosion analogy method according to claim 3 is it is characterised in that the calculating side of described loading counterweight weight
Method is：
Scene is selected naturally to test accelerated ratio n, the loading stress size calculating along stress direction m is σ x=σ m+ (2n-1) (σ
P- σ m)/2n, wherein σ m is the instantaneous maximum tensile stress size that described sample bears, and σ p is ultimate tensile stress；
Calculated by stress corrosion interfacial area Sm of described loading stress size σ x and premeasuring and load counterweight weight Gm=σ x*
Sm/g.
5. stress corrosion analogy method according to claim 3 is it is characterised in that the computational methods of described spring elongation
For：
Calculate tension spring loading force σ y=σ a+ (2n-1) (Ka- σ a)/2n, wherein σ a is that the static stress that described sample is subject to is big
Little, for naturally testing accelerated ratio, Ka is threshold fracture stress intensity factor to n；
Loading spring pulling force σ y*Sa is calculated by the stress corrosion sectional area Sa of described tension spring loading force σ y and premeasuring.
6. stress corrosion analogy method according to claim 4 is it is characterised in that described ultimate tensile stress σ p is by pre- reality
Test an acquisition, described preliminary experiment one specifically includes：
Described hardware sample to be selected carries out tension test along along described stress direction m, draws stress strain curve, obtains from curve
Obtain described ultimate tensile stress σ p, described ultimate tensile stress σ p is that stress and strain is proportional during tension test
Maximum stress.
7. stress corrosion analogy method according to claim 5 is it is characterised in that described threshold fracture stress intensity factor
Ka is obtained by preliminary experiment two, and described preliminary experiment two specifically includes：
Described hardware 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 threshold fracture stress intensity factor Ka, and described threshold fracture stress intensity factor Ka started to affect for the time in curve
The critical value of stress intensity factor change.
8. the stress corrosion analogy method according to claim 4 or 5 is it is characterised in that described stress corrosion analogy method
Also include before：
Its static stress direction a of being subject to of concrete application environmental analysis according to described sample and static stress size are σ a, suffered hold
It is m by instantaneous direction of maximal stress, instantaneous maximum stress size is σ m, the instantaneous maximum stress frequency of occurrences is f.
9. stress corrosion analogy method according to claim 3 is it is characterised in that described stress corrosion includes simulating quiet answering
The corrosion that power effect causes and residual stress act on the corrosion causing.
10. stress corrosion analogy method according to claim 3 it is characterised in that described stress corrosion analogy method it
Also include afterwards：
Hardware sample to be selected after described loading stress is placed under natural environment and carries out field test, record produces
The stress corrosion fracture time so that finally select the hardware material of practical application in engineering according to described rupture time length
Material.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107941610A (en) * | 2017-10-17 | 2018-04-20 | 威凯认证检测有限公司 | A kind of high molecular material ageing-resistant performance evaluation test method and device |
| CN114112877A (en) * | 2021-09-06 | 2022-03-01 | 江苏科泰检测技术服务有限公司 | Metal corrosion resistance detection method |
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| CN106442298B (en) | 2019-05-07 |
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