Standard Test Items:
Tensile stress, tensile strength, breaking strength, elongation at break, stress at constant elongation, elongation at constant stress, force at constant stress, tear strength, force at any point, elongation at any point, pull-out force, adhesive force and peak value calculation, pressure test, shear peel force test, bending test, pull-out force and puncture force test.
Special Test Items:
1. Elastic modulus (Young's modulus): The ratio of the normal stress component to the normal strain in the same phase. It is a coefficient for determining the stiffness of a material; the higher the value, the stronger and tougher the material.
2. Proportional limit: The maximum stress at which load and elongation maintain a proportional relationship within a certain range is called the proportional limit.
3. Elastic limit: The maximum stress that a material can withstand without permanent deformation.
4. Elastic deformation: The deformation of the material completely disappears after the load is removed.
5. Permanent deformation: The deformation that remains in the material after the load is removed.
6. Yield Point: When a material is stretched, the deformation increases rapidly while the stress remains constant; this point is called the yield point. There are upper and lower yield points, with the upper yield point generally considered the primary yield point. Yield: When the load exceeds the proportional limit, the elongation is no longer proportional; the load drops abruptly, then fluctuates over a period of time, with significant changes in elongation. This phenomenon is called yielding.
7. Yield Strength: The quotient obtained by dividing the load at which the permanent elongation reaches a specified value under tension by the original cross-sectional area of the parallel section.
8. Spring Value (K): The ratio of the component of the force in phase with the deformation to the deformation.