标准摘要
[中文适用范围]： ISO 6721 的各个部分规定了在线性粘弹性行为范围内测定硬质塑料动态力学性能的方法。本文件规定了定义并描述了通用原则，包括后续部分中各个测试方法所共有的所有方面。 [外文原描述]： The various parts of ISO 6721 specify methods for the determination of the dynamic mechanical properties of rigid plastics within the region of linear viscoelastic behaviour. This document specifies the definitions and describes the general principles including all aspects that are common to the individual test methods described in the subsequent parts. Different deformation modes can produce results that are not directly comparable. For example, tensile vibration results in a stress which is uniform across the whole thickness of the specimen, whereas flexural measurements are influenced preferentially by the properties of the surface regions of the specimen. Values derived from flexural-test data will be comparable to those derived from tensile-test data only at strain levels where the stress-strain relationship is linear and for specimens which have a homogeneous structure.
英文名称Plastics — Determination of dynamic mechanical properties — Part 1: General principles