CN109141849A - A method of improving boom structure fatigue life - Google Patents
A method of improving boom structure fatigue life Download PDFInfo
- Publication number
- CN109141849A CN109141849A CN201810882370.0A CN201810882370A CN109141849A CN 109141849 A CN109141849 A CN 109141849A CN 201810882370 A CN201810882370 A CN 201810882370A CN 109141849 A CN109141849 A CN 109141849A
- Authority
- CN
- China
- Prior art keywords
- residual stress
- welding
- fatigue life
- boom structure
- stress
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention proposes a kind of methods for improving boom structure fatigue life, and the residual stress by handling local weld seam is realized, comprising the following steps: the stress envelope for obtaining weld seam determines the local danger position of weld seam under corresponding dangerous working condition according to stress value；It obtains under corresponding dangerous working condition, the welding residual stress distribution map at local danger position；It is estimated in conjunction with welding residual stress distribution map, and to influence of the residual tension to fatigue strength at local danger position, the processing method and technological parameter of welding residual stress is determined according to welding residual stress, and handle the local danger position.The present invention is by determining the maximum local danger position of weld seam residual tension and handling for the local danger position, to accurately improve the fatigue life of the boom structure.
Description
Technical field
The present invention relates to boom structure assessment detection field more particularly to a kind of sides for improving boom structure fatigue life
Method.
Background technique
Swing arm is the important component of engineering machinery, it is connected with rack, rocker arm, oil cylinder and shovel (digging) bucket.Generally
Formed by two blocks of swing arm plates, support plate and oval cylinder beam welding, it be critical support in engineering machinery equipment and
Main force structure still suffers from certain shock loading in addition to bearing biggish quiet service load during the work time.Swing arm
The weld seam of structure is influenced to be easier the position of cracking by welding procedure.The method for solving the problems, such as this in the prior art is divided into two
Kind: one kind is to enhance the Intensity Design of weld seam from design angle；Another kind passes through processing mode for welding after the completion and improves
The intensity of weld seam.From the angle of design, it is involved in the problems, such as relatively more, therefore is that comparison is reasonable by after welding treatment method
Selection.The complexity of boom structure welding leads to weld seam after movable arm welding and its nearby there will necessarily be certain residual tension,
The presence of residual tension can reduce the fatigue strength of weld seam.
Can be used for the processing method of loading arm weld residual stress at present includes weld toe ground, ultrasonic impact etc.
It is whole weld seam Deng, processing position.Then, current processing method does not accomplish essence and two quasi- principles, but blindly right
It is handled in whole weld seam, the time required for productive temp is far longer than Local treatment, what the production time increased considerably
Meanwhile production cost can also increase therewith.Therefore, how by locally handling weld seam, it is i.e. dynamic accurately to improve weld seam
The fatigue life of arm structure is problem to be solved in the prior art.
Summary of the invention
The purpose of the present invention is to provide a kind of methods for improving boom structure fatigue life, by determining that weld seam remnants are drawn
The maximum local danger position of stress is simultaneously handled for the local danger position, to accurately improve the boom structure
Fatigue life.To achieve the above object, the invention adopts the following technical scheme:
A method of improving boom structure fatigue life, comprising the following steps:
Step A, the stress envelope for obtaining weld seam determines the part danger of weld seam under corresponding dangerous working condition according to stress value
Dangerous position；
Step B, it obtains under corresponding dangerous working condition, the welding residual stress distribution map at local danger position；
Step C, in conjunction with welding residual stress distribution map to residual tension at local danger position to the shadow of fatigue strength
Sound is estimated, and judges whether the local danger position needs to carry out the processing of welding residual stress；If so, being walked
Rapid D；Otherwise, then terminate；
Step D, the processing method and technological parameter of welding residual stress are determined according to welding residual stress, and to the office
Portion's danger position is handled.
Preferably, in step, the network model of actuator, definition material attribute, ginseng are established by FInite Element
Number, load and constraint condition；Finite element analysis is carried out to finite element model combination working condition, obtains the institute of corresponding dangerous working condition
State stress envelope.
Preferably, in step, the dangerous working condition includes that the limit is just carrying operating condition and limit unbalance loading operating condition.
Preferably, in stepb, the welding residual stress distribution map at local danger position is obtained by FInite Element；
Specific steps include: that the network model of actuator is established by FInite Element, are emulated with finite element welding control software, are led to
It crosses setting welding parameter and carries out simulation calculating, solve and obtain welding residual stress.
Preferably, in step D, the processing method of the welding residual stress includes ultrasonic peening method.
Preferably, the force value when technological parameter includes impact；The force value range 320MPa-390MPa.
Preferably, in step D, the processing method of the welding residual stress includes weld toe ground or shot-peening.
Preferably, in step D, the processing method of the welding residual stress includes that TG melts again.
Preferably, in step C, if the maximum value of the welding vestige stress of local danger position is more than reduced value,
Then carry out the processing of welding residual stress.
Compared with prior art, advantages of the present invention are as follows: the present invention is by researching and analysing the weak danger position of weld seam, so
It is handled afterwards for the residual stress at this.During residual stress processing, technological parameter is accurately controlled, that is, is guaranteed
The release of residual tension in turn avoids the damage to boom structure.The present invention is by the weld seam at danger position as a result,
Residual tension is handled, and instead of the mode handled in the prior art whole weld seam, and is accurately improved dynamic
The fatigue life of arm configuration.
Detailed description of the invention
Fig. 1 is the schematic diagram of boom structure in the prior art；
Fig. 2 is the flow chart of the method for the raising boom structure fatigue life of one embodiment of the invention；
Fig. 3 is in the method for raising boom structure fatigue life of one embodiment of the invention, and the limit is just carrying the load of operating condition
Schematic diagram；
Fig. 4 is the load of limit unbalance loading operating condition in the method for raising boom structure fatigue life of one embodiment of the invention
Schematic diagram；
Fig. 5 is the local danger position view of weld seam in Fig. 3, Fig. 4；
Fig. 6 is the welding residual stress distribution map at the second fillet in Fig. 3；
Fig. 7 is the welding residual stress distribution map at the first fillet in Fig. 4；
Wherein, 1- swing arm plate, 2- crossbeam, 3- otic placode, 4- crossbeam top front side, 5- crossbeam top rear side, the circle of 21- first
Angle, the second fillet of 22-.
Specific embodiment
It is described in more detail below in conjunction with method of the schematic diagram to raising boom structure fatigue life of the invention,
Which show the preferred embodiment of the present invention, it should be appreciated that and those skilled in the art can modify invention described herein,
And still realize advantageous effects of the invention.Therefore, following description should be understood as the extensive of those skilled in the art
Know, and is not intended as limitation of the present invention.
In the present embodiment, by taking certain model movable arm welding as an example, boom structure as shown in Figure 1 is by swing arm plate 1, crossbeam 2, branch
Fagging and floor are welded to form.Analytic explanation is carried out with the weld seam between swing arm and crossbeam 2, weld seam position will after welding
Residual tension can be generated.
As shown in Fig. 2, a kind of method for improving boom structure fatigue life, real by the residual stress for handling local weld seam
It is existing, comprising the following steps:
Step A, the stress envelope for obtaining weld seam determines the part danger of weld seam under corresponding dangerous working condition according to stress value
Dangerous position；
Step B, it obtains under corresponding dangerous working condition, the welding residual stress distribution map at local danger position；
Step C, in conjunction with welding residual stress distribution map to residual tension at local danger position to the shadow of fatigue strength
Sound is estimated, and judges whether the local danger position needs to carry out the processing of welding residual stress；If so, being walked
Rapid D；Otherwise, then terminate.
Step D, the processing method and technological parameter of welding residual stress are determined according to welding residual stress, and to the office
Portion's danger position is handled.
In the present embodiment, in step, the dangerous working condition includes that the limit is just carrying operating condition and limit unbalance loading operating condition.Swing arm
Structure in use, dangerous working condition be divided into the limit just carrying with unbalance loading situation, the limit just carrying situation be swing arm rise abruptly in the limit
When the state of rising；Unbalance loading operating condition is that maximum pressure, tire and the friction on ground system are exported according to the stability of complete machine itself, oil cylinder
The most dangerous stress condition that the comprehensive analysis such as several and complete machine dimensional parameters obtain.Determining complete machine in the pole of the course of work
The positive stress point for carrying and after unbalance loading operating condition, can determining dangerous working condition downward moving arm weld seam with finite element analysis or theoretical calculation of limit
Butut and local danger position.The network mould of actuator is established by FInite Element using finite element analysis in the present embodiment
Type, definition material attribute, parameter, load and constraint condition；Finite element analysis is carried out to finite element model combination working condition, is obtained
To the Stress Map namely stress envelope of corresponding dangerous working condition.
When the limit is just carrying operating condition, the stress condition of swing arm plate 1 and otic placode is as shown in Figure 3.Wherein, the two swing arm plates 1 in left and right
On hole at, the stress load of application is respectively 211KN and 90KN；The stress load of application on otic placode at two holes is respectively
216.5KN and 211KN extracts the biggish stress of weld stress with the stress state of weld seam under FEM calculation limiting condition
It is worth, above middle cross beam at 5 fillets of rear side, i.e. stress value at the first fillet 21 is maximum, about 145MPa, the as office of weld seam
Portion's danger position.
When limit unbalance loading operating condition, the stress condition of swing arm plate 1 and otic placode is as shown in Figure 4.Wherein, the load at the position A is about
Load is about 646kN at 1028kN, B, and load is about 800kN at C, and load is about 789kN at D.It is carried out with finite element
Analysis, according at 4 knuckles of front side, i.e. stress value at the second fillet 22 is maximum above Finite element analysis results crossbeam
About 228MPa is the local danger position of weld seam.
To sum up, the local danger position of swing arm weld seam is the two knuckle positions in the top of crossbeam 2, i.e. at the first fillet 21
It is specific as shown in Figure 5 at the second fillet 22.
In the present embodiment, in stepb, the welding residual stress at local danger position is obtained by FInite Element and is distributed
Figure；Specific steps include: that the network model of actuator is established by FInite Element, are imitated with finite element welding control software
Very, simulation calculating is carried out by the way that welding parameter is arranged, solves and obtains welding residual stress., wherein finite element welding control software includes
Simufact welding and Abaqus.After welding, weld seam position and its near zone are certain to generate boom structure
Certain residual tension, residual tension can reduce the fatigue strength of weld seam.For the numerical value of weld residual stress and its
Distribution situation can be tested by residual stress test and be obtained, and swing arm part can also be obtained by the method for finite element simulation
Welding vestige stress and distribution at danger position.For the present embodiment, it is moved using the method for finite element simulation
Welding vestige stress and distribution at arm most danger position carry out welding process emulation meter according to the real process parameter of welding
It calculates, the residual stress and Stress Field Distribution of weld seam position, the 2 two dangerous fillets in top of middle cross beam is obtained after emulation
The stress envelope at position, i.e. residual tension at the second fillet 22 and at the first fillet 21 is as shown in Figure 6, Figure 7.In Fig. 6
In, abscissa indicates that the arc length of the second fillet is 120mm, after the expansion of the second fillet, the second fillet start and ending, and the second circle
On angle between every bit and toe of weld, the arc length corresponding to every bit in the distance of the second fillet, i.e. the second fillet.It is horizontal in Fig. 7
The arc length of the first fillet of coordinate representation is 120mm, after the expansion of the first fillet, the first fillet start and ending, on the first fillet
Between every bit and toe of weld, the arc length corresponding to every bit in the distance of the first fillet, i.e. the first fillet.In the present embodiment
In, the toe of weld positioned at 2 upper surface of crossbeam is starting point, i.e., the coordinate of this toe of weld is 0.
It is insufficient after handling residual tension if the residual tension very little of the weld seam of danger position in step C
To significantly affect the fatigue life of weld seam；If the residual tension of the weld seam of dangerous position is larger, handling residual tension can
To significantly improve the weld fatigue service life.Determine whether that carrying out residual tension eliminates technique, i.e. step D according to above-mentioned analysis.It is residual
Influence of the remaining tensile stress for fatigue strength can be calculated according to relationship, and occurrence will be according to the design strength of boom structure
Depending on actual strength.In the present embodiment, danger position is the 2 two fillet transitional regions in top of weld seam crossbeam, according to remnants
The residual tension at four fillet toe of weld positions is larger known to stress simulation result, and maximum value is about 310MPa or so, guards
It calculates, influence of the residual tension to fatigue strength, can be by weld fatigue strength reduction by 0.1 times of calculating of residual tension
The presence of about 31MPa, residual tension have apparent influence to the fatigue life of weld seam, therefore the elimination of residual tension can be shown
Write enhancing weld fatigue intensity.It is determined in conjunction with the working stress state of weld seam, above the crossbeam 2 at two knuckles, i.e., the
It is the optimization process position for improving fatigue life at one fillet 21 and the second fillet 22.
In step D, the processing method of welding residual stress includes ultrasonic peening method.The technological parameter includes impact
When force value；The force value range 320MPa-390MPa.The processing method for reducing residual tension includes ultrasonic impact, toe of weld
It polishes and weld seam is made to force that method of the plastic deformation to discharge residual tension occurs.For different positions, different zero
The optimum process condition of part is different, and the selection of the optimum process condition needs to comprehensively consider the side for the treatment of process implementation result, implementation
Just the factors such as stability of property and treatment process, select optimal processing method.When carrying out weld residual stress processing,
The parameter of technique is needed and is accurately controlled, just can guarantee that residual stress is processed while not will cause damage.Comprehensive point
The factors such as ease-to-operate and the stability for the treatment of process are analysed, in the present embodiment, treatment process selects ultrasonic impact.For
Being ultrasonically treated the parameter that needs accurately to control is force value when impacting, to handle residual tension, need to make weld seam and its
It is nearby plastically deformed, therefore the position for needing specifically to impact in base material yield limit or so for the control of force value selects
Toe of weld is close to the position of base material.Yield limit or so in Q345 is needed for the control of this example force value, yield limit is passed through
Experimental test is 389MPa.In other embodiments except this embodiment, the processing method of welding residual stress further includes weldering
Toe polishing, TG melts again or shot-peening etc..
After step D, fatigue life compliance test result is set；Specifically, the stress of application different stage is described through locating
On the power arm configuration of reason, the corresponding other first average life span value of stress level is obtained；Apply the stress of corresponding level untreated
Power arm configuration on, obtain the corresponding other second average life span value of stress level；Post analysis compare the first average life span value and
Second average life span value.Determine that the effect for reducing swing arm weld seam dangerous position residual tension raising fatigue life can pass through
It formulates after corresponding test sample carries out ultrasonic implement treatment and carries out fatigue test verifying determination, the method for emulation can also be passed through
Determining reduces the effect that residual tension improves fatigue life.For the present embodiment, the method for Selection experiment is reduced
The method that residual tension improves fatigue life effect is verified, by carrying out tired examination after welding point ultrasonic implement treatment
Carry out compliance test result is tested, it is as shown in the table for test result.
The different stress level processing sample mean service life of table 1 and original sample service life
According to table 1, ultrasonic impact treatment process has a significant impact the raising in weld fatigue service life, by processing
Its fatigue life of sample have a distinct increment, fatigue strength promoted about 25MPa, enhancing rate about 22.7%.
It is concentrated since the fatigue rupture of the weld seam of boom structure is a lot of derived from weld stress or the loaded stress of weld seam is larger
Position, therefore improve the fatigue life of swing arm weld seam, carried out at residual stress just for the part for being easiest to failure
Reason processing.In processing welding lines residual stress, influence of the technological parameter of processing for treatment effect is also extremely important, processes
Journey needs to guarantee the release of residual stress, and cannot generate damage, therefore there is still a need for relatively accurate controls for the process of processing.
Therefore, in the method provided in an embodiment of the present invention for improving boom structure fatigue life, the present invention passes through research
Analysis weld seam makees weak location, is then handled for the residual stress at this.During residual stress processing, precisely
Control technological parameter, that is, guarantee residual tension release, in turn avoid the damage to boom structure.The present invention is logical as a result,
It crosses and the residual tension of the weld seam at danger position is handled, instead of what is handled in the prior art whole weld seam
Mode, and accurately improve the fatigue life of boom structure.
The above is only a preferred embodiment of the present invention, does not play the role of any restrictions to the present invention.Belonging to any
Those skilled in the art, in the range of not departing from technical solution of the present invention, to the invention discloses technical solution and
Technology contents make the variation such as any type of equivalent replacement or modification, belong to the content without departing from technical solution of the present invention, still
Within belonging to the scope of protection of the present invention.
Claims (9)
1. a kind of method for improving boom structure fatigue life, which comprises the following steps:
Step A, the stress envelope for obtaining weld seam determines the local danger position of weld seam under corresponding dangerous working condition according to stress value
It sets；
Step B, it obtains under corresponding dangerous working condition, the welding residual stress distribution map at local danger position；
Step C, the influence in conjunction with welding residual stress distribution map to the residual tension at local danger position to fatigue strength
It is estimated, and judges whether the local danger position needs to carry out the processing of welding residual stress；If so, carrying out step
D；Otherwise, then terminate；
Step D, the processing method and technological parameter of welding residual stress are determined according to welding residual stress, and are endangered to the part
Dangerous position is handled.
2. the method according to claim 1 for improving boom structure fatigue life, which is characterized in that in step, pass through
FInite Element establishes the network model of actuator, definition material attribute, parameter, load and constraint condition；To finite element model
Finite element analysis is carried out in conjunction with working condition, obtains the stress envelope of corresponding dangerous working condition.
3. the method according to claim 1 for improving boom structure fatigue life, which is characterized in that in step, described
Dangerous working condition includes that the limit is just carrying operating condition and limit unbalance loading operating condition.
4. the method according to claim 1 for improving boom structure fatigue life, which is characterized in that in stepb, pass through
FInite Element obtains the welding residual stress distribution map at local danger position；Specific steps include: to be established by FInite Element
The network model of actuator is emulated with finite element welding control software, is carried out simulation calculating by the way that welding parameter is arranged, is asked
Solution obtains welding residual stress.
5. the method according to claim 1 for improving boom structure fatigue life, which is characterized in that in step D, described
The processing method of welding residual stress includes ultrasonic peening method.
6. the method according to claim 5 for improving boom structure fatigue life, which is characterized in that the technological parameter packet
Include force value when impact；The force value range 320MPa-390MPa.
7. the method according to claim 1 for improving boom structure fatigue life, which is characterized in that in step D, described
The processing method of welding residual stress includes weld toe ground or shot-peening.
8. the method according to claim 1 for improving boom structure fatigue life, which is characterized in that in step D, described
The processing method of welding residual stress includes that TG melts again.
9. the method according to claim 1 for improving boom structure fatigue life, which is characterized in that in step C, if
The maximum value of the welding vestige stress of local danger position is more than reduced value, then carries out the processing of welding residual stress.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810882370.0A CN109141849A (en) | 2018-08-06 | 2018-08-06 | A method of improving boom structure fatigue life |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810882370.0A CN109141849A (en) | 2018-08-06 | 2018-08-06 | A method of improving boom structure fatigue life |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109141849A true CN109141849A (en) | 2019-01-04 |
Family
ID=64791451
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810882370.0A Pending CN109141849A (en) | 2018-08-06 | 2018-08-06 | A method of improving boom structure fatigue life |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109141849A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110377999A (en) * | 2019-07-11 | 2019-10-25 | 上海理工大学 | Structural fatigue strength design based on intensity field |
| CN110377998A (en) * | 2019-07-11 | 2019-10-25 | 上海理工大学 | Structure whole audience lightweight horizontal quantitative evaluation method based on fatigue strength |
| CN110427657A (en) * | 2019-07-11 | 2019-11-08 | 上海理工大学 | Structure is cold work reinforced-the quantitative adaptation design method of residual compressive stress distribution |
| CN113343360A (en) * | 2021-06-29 | 2021-09-03 | 东风汽车集团股份有限公司 | Method and device for evaluating fatigue life of triangular arm |
| CN117910320A (en) * | 2024-01-31 | 2024-04-19 | 浙江跃进锻造有限公司 | Rocker arm strength evaluation method, system and equipment |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09111796A (en) * | 1995-10-17 | 1997-04-28 | Kobe Steel Ltd | Boom for hydraulic shovel |
| JP2003149091A (en) * | 2001-11-08 | 2003-05-21 | Hitachi Constr Mach Co Ltd | Fatigue life evaluating system |
| CN2592332Y (en) * | 2003-01-20 | 2003-12-17 | 华东船舶工业学院 | Portable vibration processing device for eliminating welding residual stress |
| CN2597485Y (en) * | 2003-01-20 | 2004-01-07 | 华东船舶工业学院 | Portable vibration gun for eliminating welding residual stress |
| US20060251503A1 (en) * | 2001-12-20 | 2006-11-09 | Caterpillar Inc. | Load bearing member arrangement and method |
| KR20090111930A (en) * | 2008-04-23 | 2009-10-28 | 현대중공업 주식회사 | Method for attaching reinforce to bottom plate of the excavator arm |
| CN103874807A (en) * | 2011-09-20 | 2014-06-18 | 科技矿业企业有限公司 | Stress and/or accumulated damage monitoring system |
| CN107103121A (en) * | 2017-04-01 | 2017-08-29 | 武汉理工大学 | Consider the determination method of the steel bridge structure detail S N curves of welding residual stress |
| CN107273695A (en) * | 2017-06-30 | 2017-10-20 | 徐工集团工程机械有限公司 | Wheel loader and its equivalent load computational methods and device |
| CN107292035A (en) * | 2017-06-23 | 2017-10-24 | 江苏科技大学 | The Forecasting Methodology of the random vibration fatigue life of support containing residual stress |
-
2018
- 2018-08-06 CN CN201810882370.0A patent/CN109141849A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09111796A (en) * | 1995-10-17 | 1997-04-28 | Kobe Steel Ltd | Boom for hydraulic shovel |
| JP2003149091A (en) * | 2001-11-08 | 2003-05-21 | Hitachi Constr Mach Co Ltd | Fatigue life evaluating system |
| US20060251503A1 (en) * | 2001-12-20 | 2006-11-09 | Caterpillar Inc. | Load bearing member arrangement and method |
| CN2592332Y (en) * | 2003-01-20 | 2003-12-17 | 华东船舶工业学院 | Portable vibration processing device for eliminating welding residual stress |
| CN2597485Y (en) * | 2003-01-20 | 2004-01-07 | 华东船舶工业学院 | Portable vibration gun for eliminating welding residual stress |
| KR20090111930A (en) * | 2008-04-23 | 2009-10-28 | 현대중공업 주식회사 | Method for attaching reinforce to bottom plate of the excavator arm |
| CN103874807A (en) * | 2011-09-20 | 2014-06-18 | 科技矿业企业有限公司 | Stress and/or accumulated damage monitoring system |
| CN107103121A (en) * | 2017-04-01 | 2017-08-29 | 武汉理工大学 | Consider the determination method of the steel bridge structure detail S N curves of welding residual stress |
| CN107292035A (en) * | 2017-06-23 | 2017-10-24 | 江苏科技大学 | The Forecasting Methodology of the random vibration fatigue life of support containing residual stress |
| CN107273695A (en) * | 2017-06-30 | 2017-10-20 | 徐工集团工程机械有限公司 | Wheel loader and its equivalent load computational methods and device |
Non-Patent Citations (2)
| Title |
|---|
| 侯国清 等: "超声波冲击处理在消除装载机动臂焊缝残余应力中的应用", 《装备制造技术》 * |
| 张净华: "液压挖掘机工作装置有限元分析与焊接疲劳寿命预测", 《中国优秀硕士学位论文全文数据库 工程科技Ⅱ辑》 * |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110377999A (en) * | 2019-07-11 | 2019-10-25 | 上海理工大学 | Structural fatigue strength design based on intensity field |
| CN110377998A (en) * | 2019-07-11 | 2019-10-25 | 上海理工大学 | Structure whole audience lightweight horizontal quantitative evaluation method based on fatigue strength |
| CN110427657A (en) * | 2019-07-11 | 2019-11-08 | 上海理工大学 | Structure is cold work reinforced-the quantitative adaptation design method of residual compressive stress distribution |
| WO2021004080A1 (en) * | 2019-07-11 | 2021-01-14 | 上海理工大学 | Structural fatigue strength design method based on strength field |
| CN110377999B (en) * | 2019-07-11 | 2022-12-09 | 上海理工大学 | Structural fatigue strength design method based on strength field |
| CN110427657B (en) * | 2019-07-11 | 2022-12-09 | 上海理工大学 | Quantitative matching design method for structure cold working strengthening-residual compressive stress distribution |
| CN113343360A (en) * | 2021-06-29 | 2021-09-03 | 东风汽车集团股份有限公司 | Method and device for evaluating fatigue life of triangular arm |
| CN113343360B (en) * | 2021-06-29 | 2022-10-18 | 东风汽车集团股份有限公司 | Method and device for evaluating fatigue life of triangular arm |
| CN117910320A (en) * | 2024-01-31 | 2024-04-19 | 浙江跃进锻造有限公司 | Rocker arm strength evaluation method, system and equipment |
| CN117910320B (en) * | 2024-01-31 | 2024-08-27 | 浙江跃进锻造有限公司 | Rocker arm strength evaluation method, system and equipment |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109141849A (en) | A method of improving boom structure fatigue life | |
| Roy et al. | Fatigue resistance of welded details enhanced by ultrasonic impact treatment (UIT) | |
| CN109060326A (en) | A kind of turbine blade root position simulation test piece and design method | |
| CN105022887B (en) | Automobile reinforced support evaluation method and device | |
| WO2013061982A1 (en) | Method for controlling fatigue crack progression in metal member and metal member having controlled fatigue crack progression | |
| CN110614416B (en) | Method for optimizing welding parameters of dual-phase high-strength steel | |
| YuanZhou et al. | Local stress variation in welded joints by ICR treatment | |
| CN116227269A (en) | Multi-crack-containing steel bridge deck fatigue life analysis method, equipment and storage medium | |
| Holmstrand et al. | Fatigue life assessment of improved joints welded with alternative welding techniques | |
| JP5952085B2 (en) | High durability treatment method for steel structures | |
| CN109226933A (en) | A kind of more pass weld techniques of big thickness Hi-Stren steel multilayer determine method | |
| Kraedegh et al. | Stringer effect on fatigue crack propagation in A2024-T351 aluminum alloy welded joint | |
| CN105158092B (en) | Floorings fatigue life test device and test method | |
| Liao et al. | Fatigue resistance of rib-to-bimetallic steel deck welded joints in orthotropic steel bridge decks | |
| JP2004169340A (en) | Reinforcement method of beam structure | |
| CN107562995B (en) | Design method of ring beam of platform lifting system | |
| CN205380403U (en) | Online prosthetic devices of package cage shoe axle | |
| CN107679350A (en) | Structure lightened analogy method based on finite element analysis | |
| Jinu et al. | Investigation of the fatigue behaviour of butt-welded joints treated by ultrasonic peening process and compared with fatigue life assessment standards | |
| Cheng et al. | Research on the propagation characteristics of multiple cracks in steel bridge joints | |
| Hakimi | Post weld treatment implementation on bridges-with special focus on HFMI | |
| CN103952984A (en) | Application method of hammering closing technology for fatigue crack of steel bridge | |
| JP3900490B2 (en) | Fatigue reinforcement method for girders with flange gussets | |
| CN112861280B (en) | Pump head body design method, processing method and fracturing pump | |
| Krasnowski | Influence of High Frequency Impact Treatment (HiFIT) on fatigue strength of welded joints of high-strength steel S700MC for bridges applications |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20190104 |