Fatigue Life Analysis of Frame Based on Measured Load Spectrum

This article is based on a certain type of hoist drum, Moreover, we make the stress and mode analysis for the drum, and make preliminary check on it. Then find the position of the weak section, we calculate the force in each stage of hoisting system and draw force-timing load spectrum,we translate it into stress function of weak link. Based on above studies and conclusion, in line with the materials of the drum and Fatigue characteristic parameters and appropriate fatigue lifetime prediction model, we analysis the fatigue performance, in the end get the distribution of the drum’s fatigue life and the life of plane of weakness.

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Fatigue Life Analysis of Specimens Subjected to Infrequent Severe Loading Using a Nonlinear Kinematic Hardening Cyclic Plasticity Model

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.891-892.512 ◽

2014 ◽

Vol 891-892 ◽

pp. 512-517 ◽

Cited By ~ 4

Author(s):

Wei Ping Hu ◽

Chris Wallbrink

Keyword(s):

Fatigue Life ◽

Kinematic Hardening ◽

Cyclic Plasticity ◽

Quantitative Prediction ◽

Load Spectrum ◽

Engineering Structures ◽

Hardening Model ◽

Life Analysis ◽

Fatigue Life Analysis ◽

Severe Loading

For engineering structures subjected to cyclic load, fatigue failure normally occurs at geometrical discontinuities such as holes and notches. In aircraft structures, such locations may experience occasional severe loading that can cause appreciable local plastic deformation. This poses a significant challenge to fatigue life modelling. For such locations subjected to variable amplitude loading of a large number of cycles, the numerical analysis of fatigue life requires an accurate and robust model for cyclic plasticity, in order to reliably determine the stress and strain response. In this paper, we explore the potential of a nonlinear kinematic hardening model in improving fatigue life analysis. The work is motivated by the inability of an existing strain-life model to capture the difference in fatigue damages caused by an unclipped and clipped service load spectrum. Preliminary results show that the strain-life method based on the nonlinear kinematic hardening model was able to qualitatively demonstrate the trend in fatigue life for two critical locations analysed, and it was able to give much improved quantitative prediction for one location. Further work is under way to verify the model against more test data and to improve its capability in dealing with material cyclic softening or hardening behaviour.

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Fatigue Life Analysis and Structural Optimization of Drive Axle Housing Based on FE-SAFE

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.472-475.419 ◽

2012 ◽

Vol 472-475 ◽

pp. 419-426

Author(s):

Shang Min Zheng ◽

Shou Xu Song ◽

Yuan Sun

Keyword(s):

Fatigue Life ◽

Mode Shapes ◽

Load Spectrum ◽

Mean Values ◽

Hazardous Area ◽

Life Analysis ◽

Drive Axle ◽

Fatigue Life Analysis ◽

Improved Design ◽

Drive Axle Housing

Based on ABAQUS, the strain and stress on the drive axle housing is obtained by the static analyses. Through the model analysis, the inherent frequencies and mode shapes of front 10 order modes are obtained respectively. According to damage accumulation theory and the rain-flow counting method, and the amplitudes and mean values of counted cycles can be determined. Fatigue analysis of automotive drive axle housing under the sine load spectrum are analyzed by applying ABAQUS/FE-SAFE software, and the overall fatigue life contours and distribution of hazardous area are obtained. Under the results of analysis, the improved design of automotive drive axle housing is made. Therefore, the new methods for improving life distribution and design of automotive drive axle housing are proposed in this paper.

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Study on Fatigue Life of Pressure Vessels Based on Random Load

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.569.400 ◽

2012 ◽

Vol 569 ◽

pp. 400-404

Author(s):

Guang Zhong Hu ◽

Zhong Bin Liu ◽

Liu Kang ◽

Tao Quan Wang

Keyword(s):

Fatigue Life ◽

Design Theory ◽

Pressure Fluctuations ◽

Pressure Vessels ◽

Stochastic Dynamic ◽

Load Spectrum ◽

Random Load ◽

Life Analysis ◽

Fatigue Life Analysis ◽

Coupling Characteristics

The paper discusses the fatigue design theory of pressure vessels. For pressure vessel loads absorbed (pressure, temperature, earthquake, wind, snow, etc.) have significant stochastic dynamic characteristics and coupling characteristics, fatigue life analysis of pressure vessels based on random load history is proposed. Discusses in detail the random load spectrum rain flow counting process, the linear damage theory and fatigue life analysis. The new structure reactor of synthesis system fatigue life is calculated, the results show that the fatigue life and the design life of equipment vary widely, the need to improve pressure fluctuations of the synthesis of system.

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