Load spectrum generation using probabilistic random process and fatigue life prediction for automobile muffler structure

2008 ◽  
Author(s):  
Jung-Ho Kwon ◽  
Seon-Young Joo ◽  
Kyung-Jung Hwang ◽  
Jeong Woo Shin ◽  
Tae Wook Kim
Keyword(s):  
Fatigue Life ◽  
Random Process ◽  
Life Prediction ◽  
Fatigue Life Prediction ◽  
Load Spectrum ◽  
Spectrum Generation

Fatigue life prediction for automobile stabilizer bar

2019 ◽  
Vol 11 (2) ◽  
pp. 303-323
Author(s):  
Shuangshuang Li ◽  
Xintian Liu ◽  
Xiaolan Wang ◽  
Yansong Wang
Keyword(s):  
Fatigue Life ◽  
Life Prediction ◽  
Test Sample ◽  
Fatigue Life Prediction ◽  
Bench Test ◽  
Load Spectrum ◽  
Content Type ◽  
Life Model ◽  
On The Road ◽  
The Impact

Purpose During the running of automobile, the stabilizer bar is frequently subjected to the impact of complex random loads, which is prone to fatigue failure and accident. In regard to this, the purpose of this paper is to study and discuss fatigue life of automobile stabilizer bar. Design/methodology/approach Durability bench test shows that failure is located at the joint of sleeve and stabilizer bar body. Based on the collection and compilation of micro-strain load spectrum of the stabilizer bar, the strain-life model is studied considering the influence of average stress and maximum stress at failure area. Seven-grade strain-life curves of the stabilizer bar are established. According to the principle of linear damage accumulation, the relationship between fatigue life and damage is discussed, then the fatigue life of stabilizer bar is predicted. Fatigue life evaluation is carried out from three aspects: reliability analysis, static analysis and fatigue life simulation. Findings The results show that the reliability of the test sample is 99.9 percent when the confidence is 90 percent and the durability is 1,073 load spectrum cycles; the ratios of predicted and simulated life to design life are 2.77 and 2.30, respectively. Originality/value Based on the road load characteristics of automobile stabilizer bar, the method of fatigue life prediction and evaluation is discussed, which provides a basis for the design and development of automobile chassis components.

Probabilistic fatigue life prediction and reliability assessment of a high pressure turbine disc considering load variations

2017 ◽  
Vol 27 (10) ◽  
pp. 1569-1588 ◽  
Author(s):  
Shun-Peng Zhu ◽  
Qiang Liu ◽  
Qiang Lei ◽  
Qingyuan Wang
Keyword(s):  
High Pressure ◽  
Fatigue Life ◽  
Life Prediction ◽  
Reliability Assessment ◽  
Fatigue Life Prediction ◽  
Load Spectrum ◽  
High Pressure Turbine ◽  
Random Load ◽  
Load Variations ◽  
Turbine Disc

In the present work, a probabilistic framework for fatigue life prediction and reliability assessment of an engine high pressure turbine disc is proposed to incorporate the effects of load variations and mean stress, which provides a reference for engine structural design under a given target failure probability. Within this framework, a new probabilistic fatigue damage accumulation model under random loadings is elaborated based on a ductility exhaustion model, and probabilistic [Formula: see text] curves for the high pressure turbine disc under different flight missions are derived based on experimental data of turbine disc alloy GH4169. The influence of random load variations on fatigue reliability of the high pressure turbine disc has been investigated and quantified by combining the engine load spectrum with finite element analysis.

Compilation of load spectrum of machining center spindle and application in fatigue life prediction

2019 ◽  
Vol 33 (4) ◽  
pp. 1603-1613 ◽  
Author(s):  
Guofa Li ◽  
Shengxu Wang ◽  
Jialong He ◽  
Kai Wu ◽  
Chuanyang Zhou
Keyword(s):  
Fatigue Life ◽  
Life Prediction ◽  
Fatigue Life Prediction ◽  
Load Spectrum ◽  
Machining Center

Fatigue Life Prediction of Gear Based on Simulation Technology

2006 ◽  
Vol 324-325 ◽  
pp. 431-434
Author(s):  
Qing Bin Cui ◽  
Jing Zhu Zhang ◽  
Guan Hai Xue ◽  
Shi Chun Chen ◽  
Lei Lei
Keyword(s):  
Finite Element ◽  
Fatigue Life ◽  
Dynamic Load ◽  
Life Prediction ◽  
Strain State ◽  
The Self ◽  
Fatigue Life Prediction ◽  
Load Spectrum ◽  
Stress Strain ◽  
Transmission Gear

Dynamic analysis, finite element analysis and fatigue life analysis of transmission gear of Self-Propelled Gun is achieved in this paper according to the theory of multi-body dynamics, finite element and cumulative fatigue damage, and the well-known software Pro/E, ADAMS, PATRAN and FE-Fatigue are integrated in the research. The virtual prototyping model of self-propelled gun’s transmission box is built by ADAMS software. The dynamic load spectrum of transmission gear is achieved by virtual driving of Self-Propelled Gun. The finite element model of the gear is built by using PATRAN software, after defining reasonable boundary conditions, material and element properties, according to the load and the fatigue failure criterion of the gear, the stress-strain state of gear on load is studied. The dynamic load spectrum and the stress-strain state of the gear are considered as basic input data, the fatigue life of the gear is calculated by using FE-fatigue software. The road haul of gear without fault is predicted when the self-propelled gun drives on the second-class load surface at low speed. This method offers a new idea to the fatigue life prediction. It can predict fatigue life without experiments, and save cost and time. It has the great significance to the optimization design of the self-propelled gun.

Fatigue Life Prediction of Spring Buffer in GCD-1500 Cable Drill

2010 ◽  
Vol 118-120 ◽  
pp. 820-824
Author(s):  
Chang Gen Bu ◽  
Bo Long ◽  
J.W. Li ◽  
L. Wang
Keyword(s):  
Fatigue Life ◽  
Dynamic Response ◽  
Dynamic Simulation ◽  
Fatigue Damage ◽  
Hybrid Model ◽  
Life Prediction ◽  
Fatigue Life Prediction ◽  
Dynamic Responses ◽  
Load Spectrum ◽  
Impact Mechanism

Conventionally designed with quasi-static algorithm, buffer springs of impact mechanism eventually have a short fatigue life. By building a rigid-flexible hybrid model of GCD-1500 cable drill, the main fatigue causes of buffer springs are investigated so as to optimize the design of springs attached to impact mechanism. Dynamic simulation is used to export load spectrum of dynamic responses of springs in conditions of “idle impact” and different bore depths. Nominal stress method is employed in nSoft Software to analyze the fatigue of springs. Some crucial conclusions are drawn: the fatigue damage brought by load spectrum of dynamic response is more severe than that brought by quasi-static mono-pulse circulation; as the bore depth is prolonged, the damage of one impact will increase; the damage of “idle impact” is 25 times as serious as that of one impact when bore depth is 70m.

Thermal performance and fatigue life prediction of POP stacked chip assembly under thermal cycling load

2020 ◽  
Vol 37 (4) ◽  
pp. 165-171
Author(s):  
Dongbo Li ◽  
Jianpei Wang ◽  
Bing Yang ◽  
Yongle Hu ◽  
Ping Yang
Keyword(s):  
Fatigue Life ◽  
Thermal Cycling ◽  
Life Prediction ◽  
Solder Joints ◽  
Fatigue Life Prediction ◽  
Load Spectrum ◽  
Thermal Reliability ◽  
Joint Stress ◽  
Content Type ◽  
Fatigue Characteristics

Purpose This paper aims to perform experimental test on fatigue characteristics of package on package (POP) stacked chip assembly under thermal cycling load. Some suggestions for design to prolong fatigue life of POP stacked chip assembly are provided. Design/methodology/approach The POP stacked chip assembly which contains different package structure mode and chip position was manufactured. The fatigue characteristics of POP stacked chip assembly under thermal cycling load were tested. The fatigue load spectrum of POP stacked chip assembly under thermal cycling load was given. The fatigue life of chips can be estimated by using the creep–fatigue life prediction model based on different stress conditions. Findings The solder joint stress of top package is significantly less than that of bottom solder joints, and the maximum value occurs in the middle part of the solder joints inner ring. Originality/value This paper fulfils useful information about the thermal reliability of POP stacked chip assembly with different structure characteristics and materials parameters.

scholarly journals Multiaxial high-cycle fatigue modelling for random loading

2019 ◽  
Vol 300 ◽  
pp. 12005
Author(s):  
Haoyang Wei ◽  
Jie Chen ◽  
Patricio Carrion ◽  
Anahita Imanian ◽  
Nima Shamsaei ◽  
...  
Keyword(s):  
Fatigue Life ◽  
Normal Stress ◽  
Life Prediction ◽  
Equivalent Stress ◽  
Multiaxial Fatigue ◽  
Fatigue Life Prediction ◽  
Load Spectrum ◽  
Critical Plane ◽  
Random Loading ◽  
Random Load

In this paper, a multiaxial fatigue life prediction model is proposed under general multiaxial random loadings. First, a brief review for existing multiaxial fatigue models is given and special focus is on the LiuMahadevan critical plane concept, which can be applied to both brittle and ductile materials. Next, new model development based on the Liu-Mahadevan critical plane concept for random loading is presented. The key concept is to use two-steps to identify the critical plane: identify the maximum damage plane due to normal stress and calculate the critical plane orientation with respect to the maximum damage plane due to normal stress. Multiaxial rain-flow cycle counting method with mean stress correction is used to estimate the damage on the critical plane. Equivalent stress transformation is proposed to convert the multiaxial random load spectrum to an equivalent constant amplitude spectrum. The equivalent stress is used for fatigue life prediction. Following this, experimental design and testing is performed for Al 7075-T6 under various different random uniaxial and multiaxial spectrums. The developed model is validated with both literature and in-house testing data. Very good agreement is observed for the investigated material. Finally, conclusion and future work is given based on the proposed study.

scholarly journals Fatigue life prediction of train wheel shaft based on load spectrum characteristics

2021 ◽  
Vol 13 (2) ◽  
pp. 168781402199215
Author(s):  
Jiao Luo ◽  
Shuci Wang ◽  
Xintian Liu ◽  
Shuanglong Geng
Keyword(s):  
Fatigue Life ◽  
Life Prediction ◽  
Fatigue Life Prediction ◽  
Load Spectrum ◽  
One Dimensional ◽  
Program Load Spectrum ◽  
Program Load ◽  
The One ◽  
Design And Manufacture ◽  
Relevant Factors

Based on the analysis of load spectrum data, the loading sequence and the interaction between loads are considered, a fatigue life prediction model based on load spectrum is proposed. The load spectrum is preprocessed and the probability density function of mean and amplitude are fitted. The running condition of the train is analyzed, the one-dimensional program load spectrum of wheel and axle load is constructed by extrapolating the load spectrum. According to the modified fatigue cumulative damage method, the fatigue life of the axle is predicted with the one-dimensional program load spectrum. The relevant factors that affect the strength of the part are fully considers in the model. It more accurately reflects the objective facts of the component fatigue process. The result has more engineering reference significance and it provides a theoretical basis for the design and manufacture of train axles and ensuring safe operation.

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