Application of Multiscale Mechanics Methods in Structural Integrity Analysis

doi:10.3901/JME.2021.16.106

Abstract

Abstract: Structural integrity analysis has always been an important subject studied by scientists in the fields of mechanical engineering and mechanics. Because most of the safety regulations applied in the design and evaluation of engineering equipment are empirical, it is urgent to develop a rigorous and accurate mechanical analysis method, which can not only improve the accuracy of structural integrity assessment, but also safely improve the operating efficiency of equipment. Multiscale mechanics methods can study the mechanical behavior of materials from the microstructure of materials in different spatial scales, which is the key to fundamentally promote the structural integrity analysis from the bottom of the foundation. This article focuses on reviewing recent research achievements on multiscale mechanics for the analysis of metallic structural materials. First, molecular dynamics method is selected as a representative of microscopic research methods to introduce the research progress of deformation and fracture mechanisms of metallic structural materials at microscale. Then, based on continuum theory of crystal plasticity, a kind of multiscale mechanics with the consideration the physical mechanism and crystallographic characteristics of plastic deformation is introduced. This method takes into account the anisotropy of crystal elastic-plastic deformation behavior and has a solid physical foundation. Hence, it is a highly reliable structural integrity analysis method. Finally, the authors briefly discuss the current research difficulties and future development directions of multiscale mechanics.

Key words: multiscale mechanics, structural integrity analysis, molecular dynamics, crystal plasticity theory, physical mechanism

CLC Number:

TG156

SUN Ligang, LING Chao, CHEN Hao, LI Dongfeng. Application of Multiscale Mechanics Methods in Structural Integrity Analysis[J]. Journal of Mechanical Engineering, 2021, 57(16): 106-121.

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