样品宽度对cp-Ti 4级板在应力负荷下单轴和循环曲过程中的变形行为和可塑性的影响
Desmond Mensah1, Nicholas Pitkin1, Michael P Miles2
1Department of Mechanical Engineering, University of New Hampshire, Durham, NH 03824, USA.
Materials (Basel, Switzerland)
|December 17, 2024
概括
样品宽度显著影响板变形,更宽的样品在单轴张力下表现出更高的应变耐受性,但在循环曲时的可塑性降低. 测试方法对观察到的材料行为产生了批判性的影响.
科学领域:
- 材料科学与工程 材料科学与工程
- 机械工程 机械工程
- 金工业是金工业的一个方面.
背景情况:
- 了解商用纯4级 (cp-Ti4级) 的变形行为对于其在各种行业中的应用至关重要.
- 传统的成型极限图 (FLD) 往往假定尺寸独立的材料反应,这可能不适用于所有材料和测试条件.
- 标本几何学的影响,特别是宽度,对板的可塑性需要详细的研究.
研究的目的:
- 为了研究不同拉伸负荷条件下的cp-Ti等级4板的样品尺寸依赖的变形行为.
- 为了比较cp-Ti等级4在单轴张力 (UT) 下的可塑性与在张力下循环曲 (CBT).
- 分析样品宽度对应变局部化,骨折和厚度减小的影响.
主要方法:
- 在滚动 (RD) 和横向 (TD) 方向上测试不同宽度 (11.7140毫米) 的cp-Ti等级4样本.
- 使用数字图像相关性 (DIC) 进行全场应变测量.
- 使用有限元模拟和分析断裂表面厚度配置文件.
主要成果:
- 较宽的标本在UT下破裂时表现出更高的主要菌株,这与传统的FLD概念相反.
- CBT测试显示,随着样品宽度的增加,形状性下降,与平面应变条件的预期保持一致.
- 菌株分布分析显示,从均到多轴状态的过渡越来越宽;TD标本在UT中显示出比RD更高的可塑性.
结论:
- 4级cp-Ti板的变形行为在很大程度上取决于样品宽度和应用的负载条件 (UT与CBT).
- 通过更均地分配应变和延迟结,CBT显示了更好的可塑性,这使其成为特定变形效应的有价值测试.
- 测试方法的选择对于准确评估cp-Ti等级4的可塑性至关重要,因为结果可以根据样本宽度和测试类型而有很大差异.
相关概念视频
Deformations in a Transverse Cross Section
172
When a material is subjected to uniaxial stress, it elongates or contracts in the direction of the applied force, and also undergoes changes in the perpendicular directions. This behavior is crucial for understanding how materials behave under stress and is governed by mechanical properties such as Poisson's ratio v, which measures the ratio of transverse strain to axial strain.
As the material stretches, it expands or contracts in orthogonal directions to the load. This phenomenon varies...
As the material stretches, it expands or contracts in orthogonal directions to the load. This phenomenon varies...
172
Relation between Poisson's ratio, Modulus of Elasticity and Modulus of Rigidity
249
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.
249
Mechanical Characteristics of Steel
393
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...
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...
393
Deformations in a Symmetric Member in Bending
161
When analyzing the deformation of a symmetric prismatic member subjected to bending by equal and opposite couples, it becomes clear that as the member bends, the originally straight lines on its wider faces curve into circular arcs, with a constant radius centered at a point known as Point C. This phenomenon helps to understand the stress and strain distribution within the member more clearly.
When the member is segmented into tiny cubic elements, it is observed that the primary stress...
When the member is segmented into tiny cubic elements, it is observed that the primary stress...
161
Bending of Material: Problem Solving
172
In this lesson, determine the ratio of the maximum bending moments applied to two metal pipes, given that both pipes can withstand a maximum stress of 100 MPa. Both pipes have an outer radius of 1.8 cm. Pipe A has an inner radius of 1.5 cm, and Pipe B has an inner radius of 1 cm. The ratio of the maximum bending moment applied to two metallic pipes, each with a different inner and outer radius, is determined by considering their dimensions. The inner radius of the first pipe is 1.5 cm, and for...
172
Deformation in a Circular Shaft
265
One of the distinctive characteristics of circular shafts is their ability to maintain their cross-sectional integrity under torsion. In other words, each cross-section continues to exist as a flat, unaltered entity, simply rotating like a solid, rigid slab. To understand the distribution of shearing stress within such a shaft, consider a cylindrical section inside this circular shaft. This section has a length of L and a radius of R, with one end fixed. The radius of the cylindrical section is...
265


