Storage Modulus (E' or G')
It refers to the ability of a material to store elastic deformation energy under dynamic alternating stress, reflecting the elastic properties of the material. When a material is subjected to periodic stress (such as tension, compression, or shear), the storage modulus characterizes its "elastic stiffness" against deformation, i.e., the ratio of stress to elastic strain.
Loss Modulus (E'' or G'')
It refers to the ability of a material to dissipate energy due to internal friction (viscous dissipation between molecular chains) under dynamic alternating stress, reflecting the viscous properties of the material. When the material deforms, the loss modulus characterizes the degree to which it converts mechanical energy into thermal energy (irreversible loss).
Loss Factor (tanδ)
Also known as "damping factor" or "loss angle tangent", it is the ratio of loss modulus to storage modulus. It characterizes the relative proportion of energy loss to energy storage during dynamic loading of the material.
Testing Method: Dynamic Mechanical Analysis (DMA)
- Temperature range: -150～450℃
- Temperature accuracy: ± 0.01℃
- Frequency: 0.1～100Hz
Sample Submission Requirements and Notes
Test Examples
Reference Standards
- ASTM E111-2004 "Standard Test Methods for Young's Modulus, Tangent Modulus, and Chord Modulus"
- ASTM E1876-2007 "Standard Test Method for Dynamic Young's Modulus, Shear Modulus, and Poisson's Ratio by Sonic Resonance"
- GB/T 22315-2008 "Metallic materials - Test method for elastic modulus and Poisson's ratio"
- GB/T 14453-1993 "Metallic materials - Method for measuring elastic modulus at high temperature - Disk oscillator method"
- GB/T 24191-2009 "Method for determining the actual elastic modulus of steel wire ropes"
- GB/T 5166-1998 "Sintered metal materials and hardmetals - Determination of elastic modulus"
