Experimental Evaluation of Inelastic Constitutive Relation under Combined loading at Cryogenic Temperatures

低温联合载荷下非弹性本构关系的实验评估

• 批准号: 63550078
• 负责人: IKEGAMI Kozo
• 金额: $ 1.41万
• 依托单位: Tokyo Institute of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1988
• 资助国家: 日本
• 起止时间: 1988 至 1989
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-63550078/
• 关键词: Cryogenics; Plasticity; Stainless Steel; Combined Stress; Temperature Changes; Creep

The combined axial and torsional loading tests were carried out for SUS304 stainless steel at low temperature (77K), and temperature changing condition from 293K to 77K. The experimental results were as follows,1. The flow stress of compressive stress state was greater than that of tensile loading condition at 77K.2 . When the loading directions were changed from tension to torsion, from torsion to tension or from torsion to compression, remarkable "latent hardening" phenomena were observed. Those hardening values were measured under several loading conditions.3. Low temperature combined loading tests were conducted subsequent to tensile prestraining at room temperature. Latent hardening and stress difference between tension and compression were appeared,as same as the results at constant temperature.4. Remarkable visco-plastic behavior was observed in 77K. The creep curves were obtained under several stress levels and loading directions. Larger creep strains were produced in middle stress levels (700 - 850 MPa) than lower or higher stresses.

对SUS 304不锈钢进行了低温（77 K）和293 ~ 77 K变温条件下的轴扭复合加载试验。实验结果如下：1.在77 K时，压缩应力状态下的流变应力大于拉伸载荷状态下的流变应力。当加载方向由拉变扭、由扭变拉或由扭变压时，观察到明显的“潜在硬化”现象。在几种加载条件下测量了这些硬化值。在室温拉伸预应变后进行低温复合加载试验。与恒温条件下的结果相同，在拉伸和压缩过程中出现了潜在硬化和应力差.在77 K下观察到显著的粘塑性行为。得到了不同应力水平和加载方向下的蠕变曲线。在中等应力水平（700 - 850 MPa）下产生的蠕变应变比低应力或高应力下产生的蠕变应变大。

项目成果

Kozo IKEGAMI: "Experimental Plasticity of Metals at Low Temperature" Advances in Constitutive Laws for Engineering Materials, 1989, pp.78-84 (7 pages).

Kozo IKEGAMI：“低温金属的实验塑性”工程材料本构定律的进展，1989 年，第 78-84 页（7 页）。

Yasushi NIITSU,Kozo IKEGAMI: "A New Concept of Hereditaty Integral for Work Hardening and Softening in Plastic Deformation" Proc.of ASME P.V.P.Division. 173. 39-43 (1989)

Yasushi NIITSU、Kozo IKEGAMI：“塑性变形加工硬化和软化的遗传积分的新概念”Proc.of ASME P.V.P.Division。

Yasushi NIITSU,Kozo IKEGAMI: "A Hereditary Integral Variable for Constitutive Equation of Plastic Deformation" Proc.of PASTICTY'89. 103-106 (1989)

Yasushi NIITSU、Kozo IKEGAMI：“塑性变形本构方程的遗传积分变量”Proc.of PASTICTY89。

Yasushi NIITSU: "A Hereditary Integral Variable for Constitutive Equation of Plastic Deformation" Proc. of PLASTICITY '89, 1989, pp.103-106 (4 pages).

Yasushi NIITSU：“塑性变形本构方程的遗传积分变量”Proc。

Yasushi NIITSU,Kozo IKEGAMI: "A Hereditary Integral Variable for Constitutive Equation of Plastic Deformation" Proc.of PLASTICITY'89. 103-106 (1989)

Yasushi NIITSU、Kozo IKEGAMI：“塑性变形本构方程的遗传积分变量”Proc.of PLASTICITY89。