Evaluation of tearing instability behaviour of carbon steel for nuclear primary system.

核主系统用碳钢撕裂失稳行为评价。

• 批准号: 60550065
• 负责人: ANDO Kotoji
• 金额: $ 1.28万
• 依托单位: Yokohama National University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1985
• 资助国家: 日本
• 起止时间: 1985 至 1986
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-60550065/
• 关键词: Carbon steel pipe; Elast-plasto fracture toughness; J-R curve; Compliance; Tearing modulus; Tearing instability; Cyclic J-R curve; J integral; <J_(max)>

Elastic-plastic fracture toughness and tearing instability tests under monotonic and cyclic loading have been made by using lTCT specimens. The material used in these tests is a carbon steel pipe made for a nuclear primary system. lTCT specimens with side groove of 2.5mm in depth is extracted from the pipe in L-C direction. The main conclusions are as follows.(1) This material shows very high fracture toughness of about <J_(lc)> =0.96Mj/ <m^2> . (2) <J_(lc)> , <delta_(ic)> , J-R curve, <T_J^(mat)> and <T_(delta)^(mat)> decrease with increasing temperature. However, deformation rate has a little effect on them. (3) Critical value at instability <J_(inst)> shows on dependence on the compliance of testing system, however it decreases with increasing temperature. (4) Stress ratio R has a little effect on <J_(inst)> under cyclic load. <J_(inst)> under R=0.1 shows a little higher value than that of R=-0.1. (5) <J_(inst)> under R=0.1 is almost equal to the <J_(inst)> under monotonic load. (6) <J_(inst)> under monotonic load shows a very little scatter, and the scatter can be expressed by the weibull distribution function.

用lTCT试件进行了单调和循环加载下的弹塑性断裂韧性和撕裂失稳试验。这些测试中使用的材料是为核一回路系统制造的碳钢管。在L-C方向上，从管道中提取具有2.5mm深侧槽的lTCT试样。主要结论如下。(1)该材料具有很高的断裂韧性，约为<J_（1c）> =0.96Mj/ <m^2>。(2)<J_（lc）>、<delta_（ic）>、J-R曲线、<T_J^（mat）>和<T_（delta）^（mat）>随温度升高而减小。而变形速率对其影响不大。(3)失稳临界值<J_（inst）>与系统柔度无关，但随温度升高而减小。(4)在循环载荷作用下，应力比R对<J_（inst）>的影响较小。<J_（inst）>在R=0.1时比R=-0.1时稍大。(5)R=0.1时的<J_（inst）>几乎等于单调载荷下的<J_（inst）>。(6)在单调载荷作用下，<J_（inst）>的离散性很小，其离散性可用威布尔分布函数表示。

项目成果

Kotoji Ando and three others: "Study on the tearing instability under cyclic load." Transaction of the Japan society of mechanical engineering.

Kotoji Ando 和其他三人：“循环载荷下撕裂不稳定性的研究”。

Kotoji Ando and three others: "Experimental investigation on tearing instability." Proceeding of the international conferrence on experimental Mechanics ( Beijing ). 919-924 (1985)

Kotoji Ando 和其他三人：“撕裂不稳定性的实验研究。”

Kotoji Ando and three others: "Study on the tearing instability behaviours of controlled steel in two phase region." 35. 1151-1156 (1986)

Kotoji Ando 等三人：“两相区受控钢的撕裂失稳行为研究”。

安藤柱 他: 日本機械学会論文集. 52巻. 464-471 (1986)

Hasira Ando 等人：日本机械工程师学会汇刊，第 52 卷，464-471 (1986)。

安藤柱 他: 材料. 35巻. 1151-1156 (1986)

Hasira Ando 等人：材料，第 35 卷。1151-1156 (1986)