Determination of Mechanical Properties of Thermoplastics Suitable for Micro Systems
Determination of Mechanical Properties of Thermoplastics Suitable for Micro Systems
复制标题
适用于微型系统的热塑性塑料机械性能的测定
DOI：
10.1002/mame.200290023
复制
发表时间：
2002
影响因子：
3.9
通讯作者：
M. Brandt
中科院分区：
文献类型：
--
作者：
E. Haberstroh;M. Brandt
飞机和航空航天工业以及医疗和汽车工程不断开发更小更轻的系统部件。因此，不仅要能够生产微型零件，而且要为尺寸和设计提供性能。本文解释了宏观范围内的机械性能在多大程度上也适用于微观结构。因此，弹性模量以及屈服点处的应力和应变被视为零件尺寸标注的相关属性。不同尺寸的拉伸棒的系统研究表明，几何形状相关的性能变化显然不是特定的材料类的无定形或半结晶热塑性塑料，分别。这就是为什么需要对微量样品进行单一材料测试以确定该范围的有效特性。另一方面，从塑料的经典材料科学中已知的确定，即较低的温度以及较高的加载速率导致较硬的材料行为，也适用于微观范围。实验结果表明，温度的影响远大于变形速率的影响。通过采用不同的冷却工艺，证明了生产条件对半结晶热塑性塑料制成的试样的力学性能的影响。由此产生的不同的形态结构和机械性能的变化之间的相关性指出了微观视图的基础上。
Aircraft and aerospace industry as well as medical and automotive engineering continuously develop smaller and lighter system components. Therefore it is not only important to be able to produce micro parts but also to provide properties for dimensioning and design. This paper explains to what extent mechanical properties from the macro-range are also valid for micro structures. Thereby the modulus of elasticity as well as stress and strain at the yield point are regarded as relevant properties for the part dimensioning. Systematic investigations with tensile bars of different size show that the geometry-dependent property changes are obviously not specific for the material classes of amorphous or semi-crystalline thermoplastics, respectively. That is why a single material testing of micro samples is necessary to determine valid properties for this range. On the other hand the determination known from the classic materials science of plastics that lower temperatures as well as higher loading rates lead to a stiffer material behaviour, is also appropriate for the micro range. The measurements prove that the influence of temperature is much higher than the one of deformation rate. The influence of the production conditions on the mechanical behaviour of test specimen made of semicrystalline thermoplastics is demonstrated by using a varied cooling process. The correlation between the resulting different morphological structures and the changes in the mechanical properties is pointed up on the basis of microscopic views.