Constitutive relations of cyclic plasticity at low temperature

低温循环塑性本构关系

• 批准号: 09650089
• 负责人: IKEGAMI Kozo
• 金额: $ 1.86万
• 依托单位: TOKYO INSTITUTE OF TECHNOLOGY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1997
• 资助国家: 日本
• 起止时间: 1997 至 1998
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09650089/
• 关键词: Plasticity; Low temperature; Liquid nitrogen; Material testing; Cyclic deformation; Prestrain; Stainless steel; ステンレス鋼

Constitutive relations of cyclic loading are experimentally investigated by subjecting thin walled tubular specimens to axial load and torsional load at 77K in liquid nitrogen. The. material of specimen is stainless steel SUS304. The effects of the direction and the temperature of giving prestrain are examined by using stress-strain curves of cyclic loading.The effects of prestraining direction on cyclic stress-strain curves are as follows.(1) The prestrain transverse to cyclic loading gives, rise to large plastic hardening at the initial stage of cyclic loading. With increase of cyclic loading, the plastic hardening decreases gradually and approaches to the behavior of cyclic loading without prestrain.(2) The prestrain of cyclic loading direction produces the plastic hardening similar to accumulated plastic strain of cyclic loading.The effects of prestraining temperature on cyclic stress-strain curves are as follows.(1) The prestrain transverse to cyclic loading at 77K gives rise to larger plastic hardening than the prestrain at room temperature. With increase of cyclic loading the effect of prestraining temperature decreases.(2) The prestrain of cyclic loading direction results in similar plastic hardening at room temperature and 77K.The effects of prestraining temperature is not remarkable.

本文通过对薄壁圆管试样在液氮中77 K的轴向和扭转载荷作用下的循环加载实验，研究了薄壁圆管的本构关系。的.试件材料为不锈钢SUS 304。利用循环加载的应力-应变曲线，考察了预应变施加方向和温度对循环应力-应变曲线的影响。(1)横向于循环加载的预应变在循环加载的初始阶段产生大的塑性硬化。随着循环荷载的增加，塑性硬化逐渐减小，接近于无预应变循环荷载的行为。(2)循环加载方向的预应变产生类似于循环加载累积塑性应变的塑性硬化，预应变温度对循环应力-应变曲线的影响如下。(1)在77 K下，横向于循环加载的预应变比室温下的预应变产生更大的塑性硬化。随着循环载荷的增加，预应变温度的影响逐渐减小。(2)循环加载方向的预应变在室温和77 K下产生相似的塑性硬化，预应变温度的影响不显著。

项目成果

Kozo IKEGAMI, Yasushi NIITSU: "Experimental Investigations of Stress-Strain Relations for Complex Loadimg at Liquid Nitrogen Temperature" Proceedings of 3rd EUROPEAN MECHANICS OF MATERIALS CONFERENCE on MECHANICS AND MULTI-PHYSICS PROCESSES IN SOLIDS : Ex

Kozo IKEGAMI、Yasushi NIITSU：“液氮温度下复杂载荷的应力-应变关系实验研究”第三届欧洲材料力学会议固体力学和多物理过程会议录：Ex

Kozo IKEGAMI, Yasushi NIITSU: "Experimental Investigations of Stress-Strain Relations for Complex Loading at Liquid Nitrogen Temperature" Proceedings of 3rd EUROPE ANMECHANICS OF MATERIALS CONFERENCE on MECHANICS ANDMULTI-PHYSICS PROCESSES IN SOLIDS: Expe

Kozo IKEGAMI、Yasushi NIITSU：“液氮温度下复杂载荷的应力-应变关系的实验研究”第三届欧洲固体力学与多物理过程材料会议论文集：Expe

Tomohito Yokotsuka and Kozo Ikegami: "Effect of Pre-strain on Cyclic Loading of Stainless Steel SUS 304 at Low Temperature in Liquid Nitrogen" Transactions of the Japan Society of Mechanical Engineers. 64-617. 209-214 (1998)

Tomohito Yokotsuka 和 Kozo Ikegami：“液氮中低温下预应变对不锈钢 SUS 304 循环加载的影响”日本机械工程师学会会刊。

横塚智人, 池上皓三: "液体窒素温度下におけるステンレス鋼SUS304のねじり,引張と圧縮の繰返し変形におよぼす予ひずみの影響" 日本機械学会論文集A編. 64.617. 209-214 (1998)

Tomohito Yokotsuka、Kozo Ikegami：“液氮温度下预应变对不锈钢 SUS304 扭转、拉伸和压缩重复变形的影响”，日本机械工程师学会汇刊，A 版 64.617（1998 年）。 ）

横塚智人, 池上皓三: "液体窒素温度と室温で予ひずみを与えた後の液体窒素温度と室温での繰返し変形挙動" 材料. 48.1. 38-43 (1999)

Tomohito Yokotsuka、Kozo Ikegami：“在液氮温度和室温下预应变后在液氮温度和室温下的重复变形行为”材料 48.1 (1999)。