The methods for testing the elastic modulus of silicone resin mainly include tensile test, compression test, bending test, etc. The following is an introduction for you:
Tensile test
Principle: According to Hooke's Law, within the range of elastic deformation, the stress of the material is proportional to the strain. By applying axial tension to the silicone resin sample and measuring its elongation under tension, the stress and strain are calculated, and the elastic modulus is obtained.
Operation steps
Sample preparation: Prepare dumbbell shaped or rectangular tensile specimens that meet the requirements according to relevant standards, such as ASTM D638 (American Society for Testing and Materials) or GB/T 1040 (Chinese National Standard).
Install the specimen: Install the prepared specimen onto the fixture of the tensile testing machine, ensuring that the axis of the specimen coincides with the tensile axis of the testing machine.
Set parameters: Based on the approximate performance and testing requirements of silicone resin, set the tensile speed of the testing machine, generally between 1-500mm/min.
Conduct experiment: Start the testing machine and apply tension to the specimen until it fractures. During the experiment, the testing machine automatically records the tensile force and corresponding elongation.
Data processing: Based on the recorded tension and elongation data, calculate the stress (tension divided by the original cross-sectional area of the specimen) and strain (elongation divided by the original gauge length of the specimen), and plot the stress-strain curve. In the stage of elastic deformation, the slope of the curve is the elastic modulus.
compression test
Principle: Similar to the tensile test, axial pressure is applied to the silicone resin sample, and its compression deformation under pressure is measured. The stress and strain are calculated to obtain the elastic modulus.
Operation steps
Sample preparation: Prepare compressed cylindrical or cubic specimens with dimensions that comply with relevant standard requirements.
Install the specimen: Place the specimen at the center of the compression testing machine's pressure plate, ensuring that the pressure plate is in full contact with the specimen surface and uniformly subjected to force.
Set parameters: Set the compression speed of the testing machine, usually 0.5-5mm/min.
Conduct experiment: Start the testing machine to apply pressure to the sample, record the pressure and corresponding compression deformation until the specified compression amount is reached or the sample is damaged.
Data processing: Calculate stress (pressure divided by the original cross-sectional area of the specimen) and strain (compression deformation divided by the original height of the specimen), draw stress-strain curves, and take the slope of the elastic deformation stage curve as the elastic modulus.
Bending test
Principle: By applying a bending load to a silicone resin sample to induce bending deformation, the bending stress and strain of the sample are measured, and then the elastic modulus is calculated.
Operation steps
Sample preparation: Prepare curved specimens with rectangular cross-sections, and the length, width, and thickness should meet relevant standards.
Install the specimen: Place the specimen on two support points of the bending test device, with the loading point located in the middle of the specimen.
Set parameters: Set the loading speed, usually between 1-5 mm/min.
Conduct experiment: Start the testing device to apply bending load to the sample, record the load and corresponding deflection (bending deformation) of the sample.
Data processing: Based on the load, deflection, and geometric dimensions of the specimen, calculate the bending stress and strain, draw the stress-strain curve, and determine the elastic modulus through the slope of the curve.
Dynamic Mechanical Analysis (DMA)
Principle: Apply a dynamic sinusoidal alternating load to a silicone resin sample and measure its dynamic mechanical properties at different frequencies and temperatures, including storage modulus, loss modulus, and loss factor. The storage modulus is closely related to the elastic modulus. By analyzing the relationship between the storage modulus and temperature and frequency, the elastic modulus of silicone resin under different conditions can be obtained.
Operation steps
Sample preparation: Prepare rectangular or circular specimens of appropriate size, with specific dimensions determined according to the requirements of the DMA instrument.
Install the sample: Install the sample onto the fixture of the DMA instrument, ensuring that the sample is securely installed and in the correct position.
Set parameters: Set the temperature range, heating rate, frequency, and other parameters for the experiment.
Conduct experiments: Start the DMA instrument and perform dynamic mechanical tests on the sample under set conditions, recording the curves of changes in storage modulus, loss modulus, loss factor, and other data with temperature or frequency.
Data processing: Obtain the storage modulus value at the required temperature or frequency from the storage modulus curve, and calculate the elastic modulus based on relevant theories and formulas.

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