Dear All,

Have you experienced to do the bending Test for plastics part ?
would you mind to share me the method to do the test

Thanks and Best Regards,

There are many test/standards available. You could have a better answer if you can be more specific - what type of plastic material, which property are you interested in (flexural, creep, etc) and what kind of product are you talking about.

There are many test/standards available. You could have a better answer if you can be more specific - what type of plastic material, which property are you interested in (flexural, creep, etc) and what kind of product are you talking about.

Dear Harry,
the material that i want to test is made from ABS Blend with PC(polycarbonate),

i've found ASTM D747 about method of Bending Test,
Please le tme knoe whether this Bending Test represent to got the result,

Thanks and Best Regards,

.................... i've found ASTM D747 about method of Bending Test, Please le tme knoe whether this Bending Test represent to got the result,............................

ASTM D747
Significance and Use

This test method provides a means of deriving the apparent bending modulus of a material by measuring force and angle of bend of a cantilever beam. The mathematical derivation assumes small deflections and purely elastic behavior. Under actual test conditions, the deformation has both elastic and plastic components. This test method does not distinguish or separate these, and hence a true elastic modulus is not calculable. Instead, an apparent value is obtained and is defined as the apparent bending modulus of the material. The tangent modulus obtained by Test Methods D 790 is preferred, when the material can be tested by the Test Methods D 790 test procedure.

Because of deviations from purely elastic behavior, changes in span length, width, and depth of the specimen will affect the value of the apparent bending modulus obtained; therefore, values obtained from specimens of different dimensions may not necessarily be comparable.

Rate of loading is controlled only to the extent that the rate of angular change of the rotating jaw is fixed at 58 to 66°/min. Actual rate of stressing will be affected by span length, width, depth of the specimen, and weight of the pendulum.

For many materials, there may be a specification that requires the use of this test method, but with some procedural modifications that take precedence when adhering to the specification. Therefore, it is advisable to refer to that material specification before using this test method. Table 1 of Classification System D 4000 lists the ASTM materials standards that currently exist.

Note 2—A discussion of the theory of obtaining a purely elastic bending modulus, using a cantilever beam testing apparatus, can be found in Appendix X1. The results obtained under actual test conditions will be the apparent bending modulus.

Does this description answer your needs? If not, the answer is No.

Unless you know what you are testing for, how can you determine which standard is appropriate? Neither can anybody else tell you which standard is appropriate. First, I think you need to find out the reason or purpose of the test! Otherwise, find out which particular standard your test need to comply with.