Simulation of Low-Temperature Localized Serrated Deformation of Structural Materials in Liquid Helium Under Different Loading Modes and Potential Energy Accumulation

IF 0.7 4区 材料科学 Q4 MATERIALS SCIENCE, CHARACTERIZATION & TESTING
E. V. Vorobyov, T. V. Anpilogova
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Abstract

Numerical results are presented for the low-temperature serrated deformation process in tension induced by a suspended load of 03Kh20N16AG6 austenitic steel and AMg5 aluminum alloy specimens in liquid helium at 4 K. In practice, large loads at cryogenic temperatures are met with liquefied gas tanks, in particular in hydrogen tanks of launch vehicles. The local one-dimensional multiparametric nonlinear mathematical model of the low-temperature serrated metal deformation process was constructed, with its adequate display and quantitative estimates based on mechanical material properties and loading system characteristics. This effect manifests the local thermomechanical metal deformation instability under adiabatic conditions. The mathematical problem was formulated as a nonlinear differential equation of second order with certain initial and other conditions. It represents the dynamic equilibrium of the specimen-loading device system and describes the process of serrated specimen deformation as the system motion. The model is specified for 03Kh20N16AG6 steel and AMg5 aluminum alloy specimens creep-tested in liquid helium. The numerical experiment demonstrated adequate accuracy with the computational method. The qualitative similarity of the process was revealed for the materials of different classes, with the strain levels achieved differing markedly. Comparative computations established that potential energy of the gravitational field induced a much larger localized deformation of the specimen than potential elastic energy, even in combination with additional factors, viz operation of an electric or hydraulic drive, when the deformation rate is two orders of magnitude higher than the standard one for static metal tests in tension. A very large strain arising and localized under slow loading relaxation inevitably fails before the serrated process is complete.

Abstract Image

模拟液氦中结构材料在不同加载模式和势能积累下的低温局部锯齿状变形
本文给出了 03Kh20N16AG6 奥氏体钢和 AMg5 铝合金试样在 4 K 液氦中悬浮载荷引起的低温锯齿状拉伸变形过程的数值结果。低温锯齿状金属变形过程的局部一维多参数非线性数学模型已经建立,并根据材料的机械性能和加载系统特性进行了充分的显示和定量估算。这种效应体现了绝热条件下局部热机械金属变形的不稳定性。数学问题被表述为一个具有特定初始条件和其他条件的二阶非线性微分方程。它表示试样-加载装置系统的动态平衡,并将锯齿状试样的变形过程描述为系统运动。该模型适用于在液氦中进行蠕变试验的 03Kh20N16AG6 钢和 AMg5 铝合金试样。数值实验证明计算方法具有足够的准确性。不同等级材料的蠕变过程在本质上具有相似性,但达到的应变水平有明显差异。比较计算表明,当变形率比静态金属拉伸试验的标准变形率高出两个数量级时,重力场势能引起的试样局部变形比弹性势能引起的变形大得多,即使结合其他因素(即电动或液压驱动装置的运行)也是如此。在缓慢加载松弛条件下产生的局部大应变不可避免地会在锯齿过程完成之前失效。
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来源期刊
Strength of Materials
Strength of Materials MATERIALS SCIENCE, CHARACTERIZATION & TESTING-
CiteScore
1.20
自引率
14.30%
发文量
89
审稿时长
6-12 weeks
期刊介绍: Strength of Materials focuses on the strength of materials and structural components subjected to different types of force and thermal loadings, the limiting strength criteria of structures, and the theory of strength of structures. Consideration is given to actual operating conditions, problems of crack resistance and theories of failure, the theory of oscillations of real mechanical systems, and calculations of the stress-strain state of structural components.
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