Break, Fracture, and Rupture testing - Destructive testing can involve tensile, compressive, shear and other test methods where the product is tested to failure. Often this testing is used to determine the “peak” measurements that occur prior to the break event. Lx systems allow you to measure precisely based on stress, strain, load, displacement and time. Load rate testing - Load hold testing is a more complex testing method compared to testing to a set point at a specific velocity. Load hold testing can be used on consumer products, such as children’s attire, to measure the pull strength of buttons and their resistance to breaking loads. Contact closure testing - The “make and break” load for an electrical switch can be measured precisely. Load is applied to the switch and the peak load is measured when the switch closes/opens. This type of application can be tested on keypads, membranes, and other materials that utilize a resistance change. Insertion/Extraction testing - Insertion/extraction testing is performed on electronic components like jacks, medical devices, consumer products, and more. The loads are measured in both directions- tensile and compressive to determine the sample’s characterization for the application and for product life-cycle determination. Creep and Relaxation testing - The deformation of foam and similar materials under an applied load below yield strength can be measured and analyzed. Knowing the material’s ability to maintain its specified deformation is important for comfort and longevity in its intended application. Spring testing - Compression and extension springs are evaluated for spring rate and spring constant. Using free length or specified lengths at load targets, it’s important to verify the performance of springs to ensure reliability for the intended application whether it’s for aerospace or consumer products like mattresses.
Applications. Starrett knows force analysis and measurement.
Tensile testing - Identifying tensile force characteristics such as peak load is critical in validating a product’s safety and application. Whether it’s consumer products, medical products, packaging materials or fasteners used in the building trades, tensile testing is a fundamental measurement available on all Lx systems. Shear testing - Shear tests help measure the deformable mechanical properties of cosmetics, plastics, composites, fluids and other samples. Lap shear testing can be used to measure mechanical weld strength or the adhesive strength of epoxies. Peel testing - Adhesive strength properties are measured to understand the bonding capabilities of coatings and glues on various types of materials- from paper to substrates to building materials. Both 90° and 180° testing can be performed to measure the peak holding strengths under standard test methods such as ASTM F88. Compressive testing - Compressive loads are important in evaluating packaging designs, such as top load testing. Core sampling of concrete-based products are measured to determine their strength. And springs are analyzed under load to determine spring rate based on free length.
Flexural testing - Flexural strength and material stiffness represent the combined effects of a sample’s basic tensile, compressive and shear characteristics. Composites, wood products, paper products can be tested in both 3- and 4-point methods to determine their stiffness and resilience.
Coefficient of friction testing - ASTM D1894 is a common test method for measuring coefficient of friction. Materials such as plastic sheeting can be tested to measure both the static and kinetic frictional characteristics. Other materials, such as flooring products are tested to determine their slip resistance and safety under various environmental conditions.
Applications
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