使用振动脉冲激发3D打印尼龙12CF的动态弹性性能的确定
Pedro F Garcia1, Armando Ramalho2,3, Joel C Vasco1
1ESTG-IPLeiria-School of Technology and Management, Polytechnic Institute of Leiria, 2411-901 Leiria, Portugal.
Polymers
|August 14, 2025
概括
脉冲振动激发 (IEV) 方法准确地描述了3D打印复合材料的异型机械性能,为增材制造应用提供了传统测试的可访问替代方案.
科学领域:
- 材料科学 材料科学 材料科学
- 机械工程 机械工程
- 添加剂制造 添加剂制造 添加剂制造
背景情况:
- 材料挤出 (MEX) 对结构部件至关重要,需要精确的机械性能评估.
- 传统的异型弹性行为分析方法往往是昂贵和耗时的.
- 像尼龙12CF这样的3D打印复合材料,表现出由制造过程影响的固有异构性质.
研究的目的:
- 评估脉冲振动激发 (IEV) 方法,以表征3D打印复合材料的动态机械性能.
- 为了比较IEV衍生的动态特性与通过拉伸试验获得的准静态特性.
- 评估IEV的适用性,以确定增材制造部件的正方形弹性特性.
主要方法:
- 振动的冲动刺激 (IEV) 用于测量动态机械性能.
- 进行了拉伸测试,以获得准静态弹性特性.
- 使用尼龙12CF (35%短碳纤维) 经过融合沉积建模 (FDM) 处理.
主要成果:
- 对沉积平面垂直的IEV确定的Young模量 (E33) 比数据表值高14.77%.
- 在IEV和延拉试验之间观察到一个22.95%的差异,用于沉积平面45度的模量 (E45).
- 沉积平面中的Poisson比率 (v12) 在IEV和拉力测试之间显示了6.78%的差异.
结论:
- 该IEV方法是一个可行的和可访问的替代品,用于表征3D打印材料的异构性质.
- 通过IEV获得的动态属性与准静态属性相对应,为设计提供关键数据.
- 结果支持使用IEV用于通过增材制造生产的组件的有限元模拟.
相关概念视频
01:16Dynamic Modulus of Elasticity of Concrete
540
The dynamic modulus of elasticity assesses how a concrete structure deforms under impact or dynamic loads. It is typically higher than the static modulus of elasticity, measured under slow, steady loading conditions.
The sonic test is a common method to determine the dynamic modulus. In this test, a concrete beam, sized either 6 x 6 x 30 inches or 4 x 4 x 20 inches, is clamped at its center. Vibrations are initiated at one end of the beam by an electromagnetic exciter unit powered by...
The sonic test is a common method to determine the dynamic modulus. In this test, a concrete beam, sized either 6 x 6 x 30 inches or 4 x 4 x 20 inches, is clamped at its center. Vibrations are initiated at one end of the beam by an electromagnetic exciter unit powered by...
540
01:19Members Made of Elastoplastic Material
157
The behavior of elastoplastic materials under bending stresses, particularly in structural members with rectangular cross-sections, is crucial for predicting material responses and understanding failure modes. Initially, when a bending moment is applied, the stress distribution across the section follows Hooke's Law and is linear and elastic. This distribution means the stress increases from the neutral axis to the maximum at the outer fibers, up to the elastic limit.
As the bending moment...
As the bending moment...
157
01:21Plastic Behavior
262
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...
262
01:15Strain and Elastic Modulus
4.1K
The quantity that describes the deformation of a body under stress is known as strain. Strain is given as a fractional change in either length, volume, or geometry under tensile, volume (also known as bulk), or shear stress, respectively, and is a dimensionless quantity. The strain experienced by a body under tensile or compressive stress is called tensile or compressive strain, respectively. In contrast, the strain experienced under bulk stress and shear stress is known as volume and shear...
4.1K
01:20Elasticity in Concrete
137
Upon subjecting concrete to moderate or high uniaxial compressive or tensile stresses, the strain response is non-linear relative to the stress applied. As the stress is removed, the resulting stress-strain curve deviates from the original path traced during loading, creating a hysteresis loop, indicative of the concrete's non-linear and non-elastic properties. Typically, a material's modulus of elasticity, which is a measure of the material's stiffness, is inferred from the linear...
137
01:20Elastic Strain Energy for Shearing Stresses
284
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...
284