用一个变形几何序列完整地描述了大块成形中的断裂成形极限

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2023-07-10 DOI:10.1177/03093247231187015

Rui F. V. Sampaio, João P. M. Pragana, I. Bragança, Carlos MA Silva, Paulo A. F. Martins

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引用次数: 1

摘要

本文提出了在从单轴压缩到等双轴拉伸的各种应变加载路径下，确定断裂形成极限的打乱几何序列。结合数字图像相关和压缩力随时间的实验演化，得到主应变空间中的断裂应变，并利用应变加载路径的瞬时斜率实现有效应变-应力三轴空间中断裂应变的表示。通过结合Cockcroft-Latham准则和McClintock准则建立的非耦合韧性断裂准则对断裂时的实验应变进行建模，并使用扫描电镜进行断口分析，可以理解和表征剪切和拉伸的裂纹张开模式，以及观察到混合裂纹张开模式的不确定区域。结果证实，用于确定大块成形中断裂成形极限的新打乱几何序列的总体理念和目标类似于板材成形中常用的中岛试验。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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A complete characterization of THE fracture forming limits in bulk forming by means of an upset geometry sequence

This paper presents an upset geometry sequence to determine the fracture forming limits in a wide variety of strain loading paths ranging from uniaxial compression to equibiaxial tension. The strains at fracture in principal strain space are obtained by combination of digital image correlation and experimental evolutions of the compression force versus time, and their representation in the effective strain versus stress triaxiality space is accomplished by means of a new analytical framework that uses the instantaneous slope of the strain loading paths. Modeling of the experimental strains at fracture by means of an uncoupled ductile fracture criterion built upon combination of the Cockcroft-Latham and McClintock criteria and fractography analysis using a scanning electron microscope allow understanding and characterizing the crack opening modes by shear and tension as well as the uncertainty region inside which mixed crack opening modes are observed. Results confirm that the overall philosophy and objectives underlying the new upset geometry sequence for determining the fracture forming limits in bulk forming resemble those of the Nakajima test that is commonly used in sheet forming.

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.