A new test for determining the mechanical and fracture behavior of materials in sheet-bulk metal forming

Silva C. M. A.; Silva M. B.; Alves L. M.; Martins P. A. F.

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A new test for determining the mechanical and fracture behavior of materials in sheet-bulk metal forming

机译：用于确定大块金属板材成形中材料的机械和断裂行为的新测试

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摘要

This paper presents a new experimental test for determining the stress-strain curve and the fracture toughness of sheets to be used in sheet-bulk metal forming (SBMF) applications. The test is based on the utilization of double-notched specimens loaded in shear and combines the plane stress loading conditions of sheet metal forming with the three-dimensional plastic flow conditions of bulk metal forming, which are commonly found in SBMF processes. The methodology to obtain the stress-strain curve involves calculation of the shear stresses and strains along the two symmetric plastic shear zones of the test specimens up to point where cracks start to propagate along the ligaments that connect each pair of opposite notches. The determination of fracture toughness involves characterization of the evolution of load with displacement for a number of test cases performed with specimens having different ligaments between the two symmetric opposite notches. The work is performed on aluminium alloy EN AW 5754 H111 sheets with 5mm thickness and the results obtained by means of the new proposed test are compared against those from conventional mechanical and fracture characterization tests.

机译：本文提出了一种新的实验测试，用于确定将要用于板材批量成形（SBMF）的板材的应力-应变曲线和断裂韧性。该测试基于利用剪切力加载的双缺口试样，并将钣金成形的平面应力加载条件与SBMF工艺中常见的三维散装金属塑性流动条件相结合。获得应力-应变曲线的方法包括计算沿试样两个对称塑性剪切区的剪切应力和应变，直至裂纹开始沿着连接各对相对缺口的韧带开始扩展的点。断裂韧性的确定涉及表征在两个对称的相对凹口之间具有不同韧带的试样所进行的多个测试案例的载荷随位移的演变特征。该工作是在厚度为5mm的铝合金EN AW 5754 H111板材上进行的，并将通过新提议的测试获得的结果与常规机械和断裂特性测试得到的结果进行了比较。

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来源
《Proceedings of the institution of mechanical engineers》 |2017年第l8期|693-703|共11页
作者
Silva C. M. A.; Silva M. B.; Alves L. M.; Martins P. A. F.;
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作者单位

Univ Lisbon, Inst Super Tecn, IDMEC, Ave Rovisco Pais, P-1049001 Lisbon, Portugal;

Univ Lisbon, Inst Super Tecn, IDMEC, Ave Rovisco Pais, P-1049001 Lisbon, Portugal;

Univ Lisbon, Inst Super Tecn, IDMEC, Ave Rovisco Pais, P-1049001 Lisbon, Portugal;

Univ Lisbon, Inst Super Tecn, IDMEC, Ave Rovisco Pais, P-1049001 Lisbon, Portugal;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);
原文格式 PDF
正文语种 eng
中图分类
关键词
Sheet-bulk metal forming; in-plane shear test; experimentation; stress-strain curve; fracture toughness;

机译：板料成形;平面剪切试验;实验;应力-应变曲线;断裂韧性;

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KKT is a science wing that tries to solve human problems with a wider perspective aimed at solving problematic human behaviors (Plumb, Stewart, Dahl and Lundgren, 2009). It is seen that there is very little research about the new approach of ACT approach when the aiming country of our country is screened and it is thought that our country will contribute to the field of psychological counseling with the work done. In the scope of the research, experimental and control groups and preliminary test, post-test and follow-up measurements of 2x3 experimental design were used. The study's study group consists of a total of 24 (12 experimental and 12 control groups) university students studying in different departments and levels, continuing their education in the academic year of 2015-2016 in Ağrı province and İbrahim Chechen University in 2015-2016 academic year. The average age of participants in the experiment and control group is 20. There were 12 participants in the experimental group, 7 female and 5 male, and 12 participants, 7 female and 5 male in the control group. Personal Information Form and Decision Making Style Scale prepared by the researcher were used in the research. In order to decide on the tests to be used in the course of analyzing the data, the scores of the participant's Decision Styles Scale pre-test, which are placed primarily in the experimental and control groups, it was analyzed whether the basic expectations of parametric tests were answered. As a result of the analysis made, the scores, skewness and kurtosis coefficients obtained from the Decision Making Styles Scale were given to the experimental and control groups. It was determined that the distribution was normal in the result of Shapiro-Wilk test, in which the skewness and kurtosis coefficients of each sub-scale were ranked between -1 and +1. Participants in the experimental and control groups; homogeneity test results for decision-style pre-test measurements indicate that the data are homogeneous. According to the results of the Mauchly Globalness Test, it has been determined that working supports the hypothesis. It was determined that there was no significant difference between the pre-test scores obtained from dependent decision-making style of experiment and control groups, but the test group showed lower mean scores at the significant level within the scores of post-test and follow-up tests. Therefore, it can be said that the ACT-oriented psychoeducation program applied to the experimental group reduces the dependent decision-making style scores from the decision style sub-dimensions and the psychoeducation program has a lasting effect. It was determined that there was no significant difference between pre-test, post-test and follow-up scores obtained from the Spontaneous-Instant Decision Style of experiment and control groups. Thus, it can be said that this situation does not cause a significant difference in the Spontaneous-Decision-Making Style scores from the decision style sub-dimensions of the ACT-oriented psychoeducation program applied to the experimental group. The ACT -oriented psychoeducation program had a decline in the intuitive decision-making styles of the individuals, but this decrease did not create significant differences. Thus, it can be said that this situation does not make a meaningful difference in the intuitive decision style scores from the decision style sub-dimensions of the KKT oriented psychoeducation program applied to the experimental group. The pre-test scores obtained from the rational decision-making style of the experimental and control groups showed that there was a difference between the post-test and the follow-up scores, but this difference was not significant. As a result of the analysis, it was determined that the test group had higher levels of rational decision style than the pre - test scores in the post test and follow - up scores, whereas the post test and follow - up test scores in the control group rational decision style showed a decrease compared to the pre - test scores. the pre - test scores. Decision-making Styles Scale Avoidant Decision Making As a result of the analysis of the mean scores of the subscale scores of pre-test, post-test and follow-up measures, the group effect was found to be insignificant. It was determined that the experimental and control groups differed significantly from the pre-test scores obtained from the avoidant decision-making style but did not show any significant change within the scores of the post-test and follow-up tests. [O] . mustafa ercengiz, ali haydar şar 2018

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8. Study of Fatigue and Fracture Behavior of Cr-Based Alloys and IntermetallicMaterials: Effects of Processing on the Microstructure and Mechanical Behavior of Binary Cr-Ta Alloys [R] . He, Y. H., Lu, Y., Wang, D. F., 2001

机译：Cr基合金与金属间材料的疲劳与断裂行为研究：加工对二元Cr-Ta合金组织和力学行为的影响

A new test for determining the mechanical and fracture behavior of materials in sheet-bulk metal forming

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