MaTestLab > Test Standards > ASTM D7791 Standard Test Method for Uniaxial Fatigue Properties of Plastics
ASTM D7791 Standard Test Method for Uniaxial Fatigue Properties of Plastics
ASTM D7791 focuses on evaluating the compressive properties of rigid cellular plastics using plate support. This test determines fatigue characteristics of polymers when they are subjected to uniaxial stress. It involves applying a compressive force to test specimens between parallel plates and measuring deformation and load. This test helps determine compressive strength, stiffness, and deformation characteristics. Stiff or semi-rigid plastics can be tested through this test method.
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Introduction to ASTM D7791
ASTM D7791 determines the effect of processing, surface condition, stress, and so forth, on the fatigue resistance of plastic material, subjected to uniaxial stress for relatively large numbers of cycles. It provides updated guidelines and procedures for conducting compressive tests on rigid and semi-rigid cellular plastics. This test ensures that the compressive properties of rigid cellular plastics are accurately evaluated, aiding in quality control, product development, and material selection in various industries such as insulation, packaging, and structural components.
ASTM D7791 test method is widely used in industries such as insulation, packaging, and structural components. It is essential for assessing the suitability of rigid cellular plastics in various applications, including insulation, packaging, and structural components.
ASTM D7791 Test Procedure
Specimen Selection
This standard recommends using rectangular specimens with specific dimension details, such as length, width, and thickness. The length and width of the specimen are typically determined based on the capabilities of the testing equipment and the desired aspect ratio.
Test Setup and Execution
The test setup for ASTM D7791 involves preparing rectangular specimens of rigid cellular plastics. The specimens are placed between parallel plates in a compression testing machine. A compressive force is applied until failure or a predetermined deformation limit. Data on load and deformation are collected for analysis and documentation.
ASTM D7791 Test Specimens
Specimen Details
The standard specifies the requirements for specimen preparation, including any necessary conditioning or preparation prior to testing. However, the selected specimens can be cut from sheets, plates, or molded shapes, or can be molded to the desired finished dimensions.
Specimen dimensions
The dimensions of the specimen may vary depending on the specific requirements of the material being tested and the available testing equipment. However, they are selected in a manner that ensures proper alignment between the parallel plates and allows for accurate measurement of deformation and load during the compressive test.
ASTM D7791 Results
The results drawn from ASTM D7791 include the compressive strength, which represents the maximum load the material can withstand before failure, and the modulus of elasticity, which indicates the material’s stiffness. Additionally, the test can provide information on the material’s deformation characteristics, such as stress-strain behavior and compressive deformation at specific loads.
Tests Related to ASTM D7791
Important ASTM tests related to ASTM D7791 include ASTM D1621 (compressive properties of rigid cellular plastics), ASTM D1623 (compressive properties using a thin loading plate), and ASTM D695 (compressive properties of rigid plastics). These tests assess compressive strength, stiffness, and deformation characteristics, ensuring compliance with ASTM D7791 requirements.
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