The most common approaches to strain measurement in composites coupon testing involve the use of strain gauges bonded to the surface of the specimen or using a clip-on extensometer.
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Composites are now a broad and well-established family of materials and there are some exciting trends that are starting to develop.
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Alignment has always been known to influence results from mechanical testing, but the effect on composites testing can be very significant. Many ASTM and ISO standards include recommendations regarding alignment, and auditing organizations mandate that the alignment is within defined limits. Ensuring good test alignment requires high-quality testing frames, grips, and fixtures, as well as the expertise to validate the alignment. Some companies choose not to align their test frame because they feel that the cost is too high and they believe that the effect on their results is minimal. Read our study that demonstrates the huge impact that alignment can have on test results and the effect that this can have on your company’s bottom line.
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The compressive modulus and/or strength of a composite material are critical parameters for many structural uses. The factors that determine the compression strength are complex and the values of compressive strength for a composite can be much lower than values for tensile strength. One of the challenges in the compression testing of composite laminates is in understanding the various test types and standards. This white paper seeks to document and explain this field.
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This whitepaper provides an in-depth description of how the new standard replaces both the previous version of ISO 6892 and the widely-used EN 10002-1:2001 standard. It is highly relevant reading for anyone performing tensile tests on metallic materials. Instron testing machines are able to meet the demanding requirements of ISO 6892-1:2009, both Method A, based on strain rate control, and Method B, based on stress rate.
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A question frequently asked about the required data rate to meet a given accuracy is: How many data points per second are required to characterize a test? Instead, the correct questions should be: 1) What is the bandwidth of the transducer conditioning system required in order to give an accurate measurement and 2) What is the required data rate?
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