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Overview 概述

Black Writers Pub Date : 2020-04-02 DOI: 10.4324/9780429348426-7

S. Sandhu, David Dabydeen

{"title":"Overview","authors":"S. Sandhu, David Dabydeen","doi":"10.4324/9780429348426-7","DOIUrl":"https://doi.org/10.4324/9780429348426-7","url":null,"abstract":"ASTM Special Technical Publications relate a long tradition of fundamental contributions to the disciplines of fatigue life prediction and fracture mechanics, with an emphasis on the understanding of the physics of these phenomena and development of appropriate experimental techniques. Some of the earliest, most significant contributions to fracture mechanics, for example, were relayed through ASTM symposia and resulting publications. The discipline of continuum damage mechanics (CDM), essentially the application of internal state variable concepts of nonequilibrium continuum thermodynamics of solids, has received increasing international attention in addressing fatigue and fracture issues in broad classes of materials. To date, CDM has received most attention abroad with particularly significant advances in Europe. One of the primary goals of the Symposium on Applications of Continuum Damage Mechanics to Fatigue and Fracture, held 21 May 1996 in Orlando, Florida was to summarize the stateof-the-art in application of damage mechanics to fatigue and fracture problems. As the field advances and its domain of fruitful applications are better understood, it is envisioned that the fatigue and fracture communities will embrace it to address many complex issues such as crack tip process zone mechanics, size and constraint effects, interaction of multiple damage modes, length scale issues in mechanics of fatigue and fracture, and so on. There are several important characteristics of CDM. In this approach, various forms of distributed damage are represented by smooth, continuous field quantities. As damage accumulates, the elastic and/or elastic-plastic stiffness degrades. The evolution of damage is typically specified through a set of first order rate equations. Multiple damage mechanics may be coupled with the thermomechanical deformation response. The CDM constitutive description is inevitably integrated within a computationally-based framework along with the governing equations of conservation of mass, momentum and energy, so that notions of \"global\" parameters which have prevailed in the early years of fracture and fatigue mechanics yield to more detailed, mechanistic local descriptions. The limitations of global approaches, which are recognized as efficient engineering tools, therefore, will be much better understood with the advent of more and more CDM applications. In some cases, computational CDM approaches will form the basis for materials design and selection for given applications. It is instructive to contrast CDM with \"micromechanics,\" another contemporary treatment of heterogeneous materials such as composites. Micromechanics typically involves application of continuum elasticity or plasticity theories to each of the individual constituents, with volume averaging over a unit cell or a representative volume element to achieve an equivalent homogeneous description at a higher length scale. The derivation of void growth theories in ductile ela","PeriodicalId":216966,"journal":{"name":"Black Writers","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122189827","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}