Bending Performance
The first method used to determine the bending properties of plastics is a three-point load system, and the second method is a four-point load system.
Influencing factors
Span-thickness ratio: when selecting the span-thickness ratio, comprehensive influence factors such as shear force, horizontal thrust of the bearing, and indentation of the indenter must be considered comprehensively;
Strain rate: under the same test thickness, the greater the span, the smaller the strain rate; the larger the test speed, the greater the strain rate;
The arc radius of the loading indenter and the support: the arc radius of the loading indenter is too small, causing the quality inspection of the indenter and the sample to be not line contact, but surface contact; if the radius of the indenter is too large, it will be Increase the influence of shear force, easy to produce shear fracture;
Temperature: Bending strength decreases with increasing temperature, but the degree of decrease varies;
Operational influence: measurement of sample size, adjustment of sample span, line contact and vertical condition of indenter and sample, and adjustment of zero point of deflection value.
Compression Performance
Compression performance is to describe the behavior of the material under lower compressive load and uniform loading rate;
Compression properties include elastic modulus, yield stress, deformation beyond the yield point, compressive strength, compressive strain, and slenderness ratio;
In practical applications, the compressive load is not always applied instantaneously. Therefore, the standard test results of the time dependence of the rigidity and strength of plastics cannot be used as the basis for designing parts;
The test is to place the sample between the two pressure plates of the testing machine, and apply a measurable force of equal magnitude and opposite direction at a constant rate along the main axis of the two end surfaces of the sample to make the sample along the axis The direction is shortened, while the radial direction is increased, resulting in compression deformation until the sample ruptures, yields or the sample deformation reaches a predetermined number.
Influencing factors
Sample material: for example, the internal stress distribution of the material, the material structure, the method of forming the sample, etc .;
Test conditions: For example, sample shape, sample size, surface roughness or friction of the upper and lower platens of the testing machine, and test speed.
LIB Xenon Arc Test Chamber conforms to various test standards, adopts a rotating sample holder, the test pieces are evenly exposed, and a high-precision detector. Support customers to customize the design and production of test boxes to meet customer testing needs.
