Numerical analysis method for influence of random shrinkage defect on mechanical property of casting

Abstract

The invention relates to a numerical analysis method for influence of a random shrinkage defect on the mechanical property of a casting. The method improves the conventional random lattice models, establishes an algorithm for generating any one random shrinkage unit, and allows the algorithm to describe unique character of combination of random cloud aggregated distribution and random scattered distribution of shrinkage. The method can generate a group of numerical value samples (the number of the samples is designated by a user) of any two-dimensional random shrinkage defect, the generated samples can achieve the area, the shape and the location of shrinkage and are random; and the random samples can be further used for statistic analysis of the influence of the random shrinkage defect on effective mechanical behaviors (such as elasticity modulus and stress concentration factors) of the casing, and then the quantitative influence of the random shrinkage defect on the effective mechanical property of the casting. The invention relates to professional fields of finite element analysis, casting defect assessment and engineering mechanics.

Description

technical field [0001] The invention belongs to the numerical simulation of random non-uniform shapes in castings (cast iron, cast aluminum, etc.), and the analysis method of defect randomness on mechanical properties, and specifically relates to a numerical analysis method of the influence of random shrinkage and porosity defects on the mechanical properties of castings . Background technique [0002] Shrinkage porosity is the formation of fine, discrete shrinkage cavities in areas of the casting that were not fed enough liquid metal to solidify last. Due to the huge size, complex shape, and many modules, it is difficult to completely avoid shrinkage and porosity defects in large castings. figure 1 It is the shrinkage porosity defect found in a diesel engine fuselage casting. Since the manufacture and processing of large castings have already condensed a very high labor value, easy scrapping will cause huge waste. In engineering, castings with a small amount of shrinkage p...

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Problems solved by technology

Patents on random defects are mainly defect inspection and diagnosis methods, such as CN200910153380.1 (a method for detecting random defects in CMOS process silicon gates), CN200910134101.7 (method for defect diagnosis and management); patent number CN200880103576.3 (Computer-implemented method for determining whether an actual defect is a potential systemic defect or a potential random defect) is a calculation method for judging the type of defects on an integrated circuit chip, and does not involve the generation algorithm of random defects

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