Evaluation of Creep-Fatigue Behavior under Multiaxial Loading Based on the Overstress Concept

基于过应力概念的多轴载荷下蠕变疲劳行为评估

• 批准号: 63460076
• 负责人: ASADA Yasuhide
• 金额: $ 3.26万
• 依托单位: The University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (B)
• 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/en/grant/KAKENHI-PROJECT-63460076/
• 关键词: Multiaxial Stress; Creep-Fatigue; Overstress; Internal Stress; 304 Stainless Steel; Environmental Effect; 304ステンレス鋼; クリープ疲労相互作用

A research has been made in order to establish a creep-fatigue life prediction procedure under multiaxial loading condition. Deformation and failure behaviors under the multiaxial creepfatigue condition were studied in detail. Hollow cylindrical test specimens were prepared with solution annealed 304 stainless steel and were subjected to a strain controlled tension-torsion under proportional loading at 650ﾟC in air. Additionally, uniaxial push-pull strain controlled creep-fatigue tests were also made with the same test material at 650ﾟC in air and in high vacuum environment.Analyses were made with stress-strain responses of the test results to obtain the overstress and the internal stress in order to make clear the relation between the inelastic deformation behaviors and those components of stress.A development of anisotropy was observed with the overstress and the internal stress even though the peak stresses showed isotropy. The time dependent behavior of the overstress showed a chan … More ge due to the ratio of normal versus shear overstress components. It was concluded that the shear component of the overstress controls the time-independent component of the inelastic deformation and that the normal component of the overstress controls the time-dependent component of the inelastic deformation. Additionally, It was made clear that the stress relaxation behavior is composed of, at least, two components: one is the relaxation of the overstress and the other is the relaxation of the internal stress. The former occurs with a high stress relaxation rate to cease within a short time duration,, however, the latter has a slow relaxation rate to last for long time.Regarding the creep fatigue failure behavior, the inelastic strain integration of the overstress controls the time-independent component of the creep-fatigue damage. Furthermore, The maximum resolved shear component of the overstress controls the environment free component of the damage. The environmental effect is included in the time-independent damage component and is governed by a resolved normal component of the overstress.The time-dependent component of the damage is well described with the time integration of the maximum principal overstress component. Obtained is the creep-fatigue life prediction equation which is available for the multiaxial loading condition including the environmental effect. Less

研究建立了多轴加载条件下的蠕变疲劳寿命预测方法。详细研究了多轴蠕变疲劳条件下的变形和破坏行为。用固溶退火的304不锈钢制备空心圆柱形试样，并在空气中于650 ℃下在比例载荷下进行应变控制的拉伸-扭转。此外，本发明还在650 ℃空气和高真空环境下进行了单轴推拉应变控制蠕变疲劳试验，并进行了应力-应变关系分析。通过对试验结果的应变响应分析，得到了超应力和内应力的分布规律，从而明确了非弹性变形行为与各应力分量之间的关系，并观察到随着超应力的增加，各向异性的发展峰值应力虽然各向同性，但内应力也是各向同性。过应力的时间依赖性行为表现出变化 ...更多信息 由于法向过应力分量与剪切过应力分量之比，得出的结论是，过应力的剪切分量控制的非弹性变形的时间无关的分量和过应力的正常分量控制的非弹性变形的时间相关的分量。此外，还明确了应力松弛行为至少由两个部分组成：一个是过应力松弛，另一个是内应力松弛。前者具有较高的应力松弛速率，在短时间内停止，而后者具有较低的应力松弛速率，并持续较长时间。对于蠕变疲劳失效行为，过应力的非弹性应变积分控制着蠕变疲劳损伤的时间无关分量。此外，超应力的最大可分辨剪切分量控制着损伤的环境无关分量。环境效应包含在与时间无关的损伤分量中，并由分解的法向过应力分量控制，而与时间相关的损伤分量则由最大主过应力分量的时间积分来描述。得到了考虑环境影响的多轴加载条件下的蠕变疲劳寿命预测方程。少

项目成果

Nakamura, T., Ishikawa, T. and Asada, Y.: "Extension of Overstress Concept for Biaxial Creep-Fatigue Behavior" Preprint of 3rd International Conference on Biaxial/Multiaxial Fatigue (University of Stuttgart) Vol. II pp.47.1-47.18 (1989).

Nakamura, T.、Ishikawa, T. 和 Asada, Y.：“双轴蠕变疲劳行为的过应力概念的扩展”第三届双轴/多轴疲劳国际会议预印本（斯图加特大学）卷。

T.Nakamura,T.Ishikawa and Y.Asada: "Relaxation Behavior of 304 Stainless Steel under Tension-Torsion Biaxial Loading" Collection and Uses of Relaxation Data in Design ASME Publication PVP. 172. 69-76 (1989)

T.Nakamura、T.Ishikawa 和 Y.Asada：“304 不锈钢在拉伸扭转双轴载荷下的松弛行为”设计 ASME 出版物 PVP 中松弛数据的收集和使用。

Nakamura, T., Ishikawa, T. and Asada, Y.: "Extension of the Overstress Concept to Biaxial/Multiaxial Creep-Fatigue Behavior" Proceedings of 3rd International Conference on Biaxial/Multiaxial Fatigue.

Nakamura, T.、Ishikawa, T. 和 Asada, Y.：“过应力概念向双轴/多轴蠕变疲劳行为的扩展”第三届双轴/多轴疲劳国际会议论文集。

T.Nakamura,T.Ishikawa and Y.Asada: "Extension of Overstress Concept to Biaixial Creep-Fatigue Behavior" Proceedings of 3rd International Conference on Biaxial/Multiaxial Fatigue.

T.Nakamura、T.Ishikawa 和 Y.Asada：“超应力概念对双轴蠕变疲劳行为的扩展”第三届双轴/多轴疲劳国际会议论文集。

T.Nakamura,T.Ishikawa and Y.Asada: "Extension of Overstress Concept for Biaxial Creep-Fatigue Behavior" Preprint of 3rd International Conference on Biaxidal/Multiaxial Fatigue. II. 47.1-47.18 (1989)

T.Nakamura、T.Ishikawa 和 Y.Asada：“双轴蠕变疲劳行为的过应力概念的扩展”第三届双轴/多轴疲劳国际会议预印本。