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Methods of predicting residual stresses and distortion in quenched aluminum castings

A residual stress, aluminum casting technology, applied in the system field of predicting residual stress and deformation in quenched aluminum castings after solution treatment, can solve problems such as unrealistic measurement

Active Publication Date: 2010-11-17
GM GLOBAL TECH OPERATIONS LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Also, it is often impractical to measure residual stresses in every location of a part, not only because of geometric constraints, but also because of the time and expense required to do so

Method used

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  • Methods of predicting residual stresses and distortion in quenched aluminum castings
  • Methods of predicting residual stresses and distortion in quenched aluminum castings
  • Methods of predicting residual stresses and distortion in quenched aluminum castings

Examples

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Embodiment Construction

[0155] As described above, the embodiments of the present invention generally relate to systems, methods, and articles of manufacture for predicting residual stress and / or deformation in quenched aluminum castings. In quenching, the residual stress and deformation caused in aluminum castings are generally caused by the difference in cooling rate, temperature and thermal shrinkage rate between the position and position of the aluminum casting geometric structure. According to an embodiment, the strain and stress analysis module predicts at least one of residual stress and deformation in the quenched aluminum casting. Using strain and stress analysis, the residual stress and deformation can be predicted by combining the thermal strain caused by quenching with the non-linear constitutive behavior of the quenched microstructure of the quenched aluminum casting. The thermal strain usually spans the entire section of the aluminum casting during quenching Caused by the non-uniform tra...

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Abstract

Computational systems, methods, and articles of manufacture to predict at least one of residual stresses and distortion in quenched aluminum castings. Residual stresses and distortion may be predicted through incorporating thermal strains induced during quenching with the nonlinear constitutive behavior of quenched microstructures of a quenched aluminum casting, wherein thermal strains arise generally from non-uniform transient temperature distribution of the casting during quenching. The transient temperature distribution of the aluminum casting during quenching may be calculated based on heat transfer coefficients specific to one or more nodes, elements and / or zones on the surfaces of the aluminum casting. The nonlinear constitutive behavior of the quenched aluminum casting may be modeled as functions of temperatures, strain rates, and microstructure variations. A material constitutive model accounts for not only strain hardening and creep, but also precipitate hardening. Thereby, residual stresses and distortion in the quenched aluminum castings can be predicted using the embodiments.

Description

Technical field [0001] The present invention generally relates to residual stresses and deformations induced in aluminum alloys, including aluminum alloy castings, during the quenching / cooling process. More specifically, the present invention relates to a system, method, and manufactured article for predicting residual stress and deformation in a quenched aluminum casting after solution treatment. Background technique [0002] Residual stress is usually defined as the residual stress in the product / part / object after the manufacturing process. Residual stresses may exist in engineering castings, films, surface coatings, composites and multiphase materials. Residual stress can arise from many sources. For example, macroscopic residual stress can be generated from heat treatment, machining, secondary thermal and mechanical processes, and assembly procedures, while microstructure residual stress is usually caused by thermal expansion / contraction mismatch between phases and componen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F17/5018G06F2217/80G06F30/23G06F2119/08
Inventor Q·王C·-C·张D·帕卢奇G·张
Owner GM GLOBAL TECH OPERATIONS LLC
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