核电安全端结构中材料拘束的作用范围

doi:10.11900/0412.1961.2020.00445

金属学报

2021, Vol. 57

Issue (12): 1645-1652 DOI: 10.11900/0412.1961.2020.00445

研究论文

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核电安全端结构中材料拘束的作用范围

戴悦¹, 杨杰¹(

), 陈浩峰²

^1.上海理工大学能源与动力工程学院上海市动力工程多相流动与传热重点实验室上海 200093
^2.Department of Mechanical and Aerospace Engineering, University of Strathclyde, Glasgow, G1 1XJ, UK

Effect Range of Material Constraint in Nuclear Safe End Structure

DAI Yue¹, YANG Jie¹(

), CHEN Haofeng²

^1.Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering, School of Energy and Power Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China
^2.Department of Mechanical and Aerospace Engineering, University of Strathclyde, Glasgow, G1 1XJ, UK

引用本文:

戴悦, 杨杰, 陈浩峰. 核电安全端结构中材料拘束的作用范围[J]. 金属学报, 2021, 57(12): 1645-1652.
Yue DAI, Jie YANG, Haofeng CHEN. Effect Range of Material Constraint in Nuclear Safe End Structure[J]. Acta Metall Sin, 2021, 57(12): 1645-1652.

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摘要:

分别选择核电安全端实际结构和简化结构为研究对象，对不同材料拘束下2种结构的J积分-弯矩曲线、等效塑性应变(PEEQ)等值线所围绕区域的面积和失效评定曲线进行计算，以考察结构中材料拘束的作用范围。结果表明：在核电安全端实际结构和简化结构中均存在着材料拘束的作用范围。J积分-弯矩曲线、PEEQ等值线所围绕区域的面积和失效评定曲线均不受材料拘束作用范围之外材料的影响。简化结构几何拘束较低、材料拘束作用范围较大、失效评定曲线略高，与实际结构相比，可能会产生非保守的评价结果。

关键词 ：核电安全端, 材料拘束, 作用范围, 失效评定曲线

Abstract：

Constraint is the resistance of a specimen or structure against plastic deformation that contains geometric and material costraints. Both can affect the fracture behavior of a material significantly. For a material constraint, most studies focused on the strength mismatch of both sides of a crack, such as over-match and under-match. Nevertheless, the effect range of the material constraint also needs to be clarified. In previous studies, the effect range of a material constraint was demonstrated in different specimens. In this study, the actual and simplified nuclear safe end structures were selected. The J-M curves (where J is the J-integral, which reflects the degree of stress and strain concentration at the crack tip due to a wide range of yield; M is the bending moment), the areas surrounded by the equivalent plastic strain (PEEQ) isoline, and the failure assessment curves of the two structures under different material constraints were calculated to determine the effect range of material constraint in structure. The results show that the effect range of a material constraint exists in actual and simplified nuclear safe end structures. The J-M curves, the areas surrounded by the PEEQ isoline, and the failure assessment curves were unaffected by the material located out of the effect range. Compared to the actual nuclear safe end structure, the simplified structure had a lower geometric constraint, a larger material constraint effect range, and a higher failure assessment curve, possibly producing a non-conservative assessment result. Thus, in the design and structure integrity assessment of a nuclear safety end structure and other strength-mismatched structures, the influence of the material constraint effect range should be considered, particularly in the following two aspects. The first aspect is that in the design process, a material with weak properties should be designed out of the material constraint effect range. This can effectively avoid weakening of the structural properties caused by the weaker material. The second is that in the assessment process, the material out of the material constraint effect range does not need to be taken into account. Only the material in the material constraint effect range should be considered, which will reduce the difficulty and workload of an assessment.

Key words： nuclear safe end material constraint effect range failure assessment curve

收稿日期: 2020-11-04

ZTFLH:

TH114

基金资助:国家自然科学基金项目(51975378)

作者简介: 戴悦，女，1996年生，硕士生

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https://www.ams.org.cn/CN/10.11900/0412.1961.2020.00445 或 https://www.ams.org.cn/CN/Y2021/V57/I12/1645

图1 核电安全端实际结构几何和简化结构几何

图2 初始周向裂纹示意图

图3 安全端实际结构和简化结构整体网格划分及裂尖局部网格划分

图4 不同材料拘束下核电安全端实际结构的J积分-弯矩(J-M)曲线

图5 不同材料拘束下不同J积分时与相同J积分时PEEQ等值线所围绕区域的面积(APEEQ)

图6 核电安全端实际结构在不同材料拘束下的失效评定图(FAD)

图7 核电安全端实际结构在不同材料拘束下的极限弯矩载荷(ML)

图8 不同材料拘束下核电安全端简化结构的J-M曲线

图9 不同材料拘束下不同J积分时与相同J积分时的APEEQ

图10 核电安全端简化结构在不同材料拘束下的FAD

图11 核电安全端简化结构在不同材料拘束下的ML

图12 52Mb宽度为100和200 mm时核电安全端实际结构与简化结构FAD的对比(a) W52Mb = 100 mm (b) W52Mb = 200 mm

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