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相关概念视频

Stress-Strain Diagram - Ductile Materials01:24

Stress-Strain Diagram - Ductile Materials

702
The stress-strain relationship in ductile materials such as structural steel or aluminium is intricate and progresses through several stages. When a specimen is loaded, it initially exhibits a linear length increase, depicted by a steep straight line on the stress-strain diagram. It indicates the material is elastically deforming and will return to its original shape once unloaded. However, when a critical stress value is reached, plastic deformation begins. This stage sees substantial...
702
Temperature Dependent Deformation01:12

Temperature Dependent Deformation

147
In a nonhomogeneous rod made up of steel and brass, restrained at both ends and subjected to a temperature change, several steps are involved in calculating the stress and compressive load. Due to the problem's static indeterminacy, one end support is disconnected, allowing the rod to experience the temperature change freely. Next, an unknown force is applied at the free end, triggering deformations in the rod's steel and brass portions. These deformations are then calculated and added...
147
Hooke's Law01:26

Hooke's Law

378
Hooke's law, a pivotal principle in material science, establishes that the strain a material undergoes is directly proportional to the applied stress, defined by a factor called the modulus of elasticity or Young's modulus.
378
Mechanical Characteristics of Steel01:18

Mechanical Characteristics of Steel

568
The mechanical characteristics of steel are assessed through various tests that evaluate its strength, toughness, and flexibility. These tests include tension, torsion, impact, bending, and hardness assessments, each providing crucial information about steel's suitability for specific applications.
The tension test is fundamental for determining tensile strength. In this test, a steel specimen is stretched using a gripping device until it breaks. The data collected during this test are used...
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Relation between Poisson's ratio, Modulus of Elasticity and Modulus of Rigidity01:15

Relation between Poisson's ratio, Modulus of Elasticity and Modulus of Rigidity

264
Deformation occurs in axial and transverse directions when an axial load is applied to a slender bar. This deformation impacts the cubic element within the bar, transforming it into either a rectangular parallelepiped or a rhombus, contingent on its orientation. This transformation process induces shearing strain. Axial loading elicits both shearing and normal strains. Applying an axial load instigates equal normal and shearing stresses on elements oriented at a 45° angle to the load axis.
264
Plastic Behavior01:21

Plastic Behavior

196
A material's elastic behavior is characterized by the disappearance of stress once the load is removed, allowing the material to return to its original state. However, when stress surpasses the yield point, yielding commences, marking the onset of plastic deformation or permanent set. This change from elastic to plastic behavior is influenced by the peak stress value and the duration before the load is removed. An intriguing observation occurs when a specimen is loaded, unloaded, and...
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相关实验视频

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Intermediate Strain Rate Material Characterization with Digital Image Correlation
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建模复杂阶段钢在高张力率下对应的反应.

Andrej Škrlec1, Tadej Kocjan1, Marko Nagode1

  • 1Faculty of Mechanical Engineering, University of Ljubljana, 1000 Ljubljana, Slovenia.

Materials (Basel, Switzerland)
|May 25, 2024
PubMed
概括
此摘要是机器生成的。

本研究使用Cowper-Symonds模型,模拟高强度钢 SZBS800 在不同拉伸率下的反应. 优化的参数准确地预测材料在不同负载条件下的行为.

关键词:
考珀-西蒙兹模型复杂阶段钢的复杂阶段钢.遗传算法是一种遗传算法.多个标准的目标功能.表面响应的表面响应.

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科学领域:

  • 材料科学 材料科学 材料科学
  • 机械工程 机械工程
  • 计算力学 计算力学 计算力学

背景情况:

  • 复杂相高强度钢需要准确的构成模型来预测性能.
  • 对于受到动态负荷的材料来说,了解延展率灵敏度至关重要.
  • 考珀-西蒙兹模型是捕捉金属应变率效应的常用方法.

研究的目的:

  • 开发和验证SZBS800钢的构成模型,考虑应变率的影响.
  • 用实验数据和数值方法确定考珀-西蒙兹模型的最佳参数.
  • 评估模型在各种拉伸率下预测材料反应的准确性.

主要方法:

  • 在低张力速率下使用拉力试验进行实验性表征.
  • 通过弹道撞击实验进行高应变率测试.
  • 应用一种粘性塑料Cowper-Symonds材料模型配方.
  • 使用逐步程序进行参数估计:网格搜索和反向工程.
  • 使用显式动态模拟,多标准成本函数和实值遗传算法进行优化.

主要成果:

  • 成功估计了SZBS800钢的考珀-西蒙兹模型参数 (SIGY,p,C).
  • 优化的模型准确地代表了材料在一系列延展率的反应.
  • 确定了参数"p"和"C"的广泛最佳域,表明参数化过程中的稳定性.

结论:

  • 开发的考珀-西蒙兹模型有效地捕捉了SZBS800钢的取决于拉伸率的行为.
  • 实验测试和高级数值优化的结合提供了可靠的材料模型参数.
  • 这些发现有助于精确模拟和设计在动态应用中使用高强度钢结构的结构.