ISO 178 is a three-point bend test where a force is applied on the midpoint of a sample, which is supported at either end.
ISO 178 Testing Standard
ISO 178 is a three-point bend testing procedure used to test the flexural property of semi-rigid and rigid plastic on a universal testing system.
The test sample is placed on two parallel anvils and bent using a compression die without breaking the piece. The applied force is measured via a load cell, and the deflection is measured either by a direct strain measurement device or the system’s crosshead displacement. The specimen’s thickness is a function of the span of the three-point bend fixture.
The ISO 178 test is stopped if the specimen breaks. If the specimen does not break, the test is continued and the stress at 3.5% (conventional deflection) is reported.
A variety of sample shapes can be used for this test but generally, a sample with dimensions – 10 mm* 4 mm* 80 mm is used. This method is usually used for determining the flexural modulus, flexural strength, and flexural strain/stress relationship under defined conditions.
The method is suitable for:
Common Uses of ISO 178 testing
Advantages of ISO 178 testing
Limitation of ISO 178 testing
Industrial Application of ISO 178 testing
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