相关实验视频
Updated: Jun 15, 2025

09:17
Surrogate Model Development for Digital Experiments in Welding
Published on: March 28, 2025
728
一种分析模型,用于预测用应变能量方法在射击炼中的残余应力
Aboozar Poozesh1, Behrooz Arezoo2
1Mechanical Engineering Department, Amirkabir University of Technology, Tehran, Iran.
Scientific reports
|August 27, 2024
概括
本研究提出了一种新的分析模型,用于通过XRD实验验证的射击缩残余应力. 较高的射击切割强度增加了压缩余应力,提高了GTD-450不钢的疲劳寿命.
科学领域:
- 材料科学 材料科学 材料科学
- 机械工程 机械工程
- 表面工程是什么?表面工程是什么?
背景情况:
- 射击削对于诱导压缩残余应力 (CRS) 至关重要,以提高材料疲劳寿命.
- 精确建模残余应力分布对于优化射击削过程至关重要.
- 现有的模型经常简化压力-应变条件,导致潜在的不准确性.
研究的目的:
- 开发和实验验证一种新型分析模型,用于射击压缩残余应力分布.
- 为了研究射击伤强度和残留压力概况之间的关系.
- 为了评估射击磨削对GTD-450不钢疲劳寿命的影响.
主要方法:
- 使用格林卡-莫尔斯基基于能量的方法和动力硬化模型来计算单射击冲击的残余应力.
- 根据平面应变和平面应力条件的结合而形成的CRS分布.
- 使用X射线衍射 (XRD) 分析进行实验验证和旋转曲试验,以确定疲劳寿命.
主要成果:
- 开发的分析模型准确地预测了剩余应力分布,实验数据证实了它的精度.
- 在表面残余应力和最大CRS之间观察到一个显著的区别,与以前的模型相比,在表面附近的曲线更大.
- 较高的射击切割强度导致了更大的最大压力余应力和更深的塑性变形层.
结论:
- 新的分析模型提供了更准确的射击压力余应力分布的表示.
- 增加的射击切削强度通过增加压力余应力的深度和大小,有效地提高了GTD-450不钢的疲劳寿命.
相关概念视频
Elastic Strain Energy for Normal Stresses
146
Strain energy quantifies the energy stored within a material due to deformation under loading conditions, a fundamental concept in materials science and engineering. The strain energy can be modeled when a material is subjected to axial loading with uniformly distributed stress. In this scenario, the stress experienced by the material is the internal force divided by the cross-sectional area, and the strain induced is directly proportional to this stress through the modulus of elasticity.
If...
If...
146
Elastic Strain Energy for Shearing Stresses
172
As discussed in previous lessons, strain energy in a material is the energy stored when it is elastically deformed, a concept crucial in materials science and mechanical engineering. This energy results from the internal work done against the cohesive forces within the material. When a material undergoes shearing stress and corresponding shearing strain, the strain energy density, which is the energy stored per unit volume, is calculated. Within the elastic limit, where the stress is...
172
Residual Stresses in Circular Shafts
165
In materials that exhibit elastic and plastic behavior, known as elastoplastic materials, residual stresses can accumulate when these materials experience plastic deformation. This deformation arises from either high levels of shearing stress or significant strains. Residual stresses are internal stresses that persist within a material after removing the external force causing deformation. This phenomenon is demonstrated when observing the behavior of a shaft under torque; notably, the...
165
Residual Stresses in Bending
153
In the study of elastoplastic members subjected to bending moments, understanding the loading and unloading phases is crucial for assessing material behavior and structural integrity. During the loading phase, as the bending moment increases, the material initially responds elastically, adhering to Hooke's Law, where stress is directly proportional to strain. When the load exceeds the yield strength, plastic deformation occurs, resulting in permanent strain and deformation that remains even...
153
Strain-Energy Density
389
Understanding the strain energy density in materials under axial load is crucial for evaluating their mechanical behavior and durability. When a rod is subjected to such a load, it elongates and stores energy, known as strain energy, as potential energy within the material. This energy is measured in terms of energy per unit volume.
In the elastic region of a material, the relationship between the stress and the strain is linear and follows Hooke's Law. The strain energy density in this...
In the elastic region of a material, the relationship between the stress and the strain is linear and follows Hooke's Law. The strain energy density in this...
389
Residual Stresses
207
Residual stresses reside in a structure even after removing the original stress inducer. This phenomenon often arises from varied plastic deformations across different parts of a structure. Consider a rod stretched beyond its yield point. It will not regain its original length due to permanent deformation. Even after load removal, the rod does not entirely lose stress because of uneven plastic deformations, resulting in residual stresses. The computation of these stresses in structures is...
207

