ASTM D198 Test Fixture

Description

ASTM D198 – Standard Test Methods of Static Tests of Lumber in Structural Sizes

ASTM D198 contains several test methods to evaluate the physical properties of various wood structural members including sawn lumber, glue laminated

timbers, composite lumber, pre-fabricated I-joists, and others.

Test methods within the specification include flexure, compression, tension, and torsion testing.

***The flexure method within ASTM D198 is one of the most popular test methods.

In this test, a structural wood member is support at its ends while a flexure load is either apply  in the center, or at two points located equidistant from

the supporting locations.

The structural member, usually a straight or a slightly cambered beam of rectangular cross section, is subjected to a bending moment by supporting it

near its ends, at locations called reactions, and applying transverse loads symmetrically imposed between these reactions.

The beam is deflected at a prescribed rate, and coordinate observations of loads and deflections are made until rupture occurs.

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Specimen For ASTM D198

1. Wood

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Grips For ASTM D198 

Bend fixture

Bend fixtures are use to determine the flexural properties of rigid and semi-rigid materials.

They are available in a variety of capacities, support diameter and widths, spans, and 3 or 4 point configurations.

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ASTM D198 / Type of UTM machine

We recommend using UTM machines with a capacity of 5kN-600kN. It depends on the strength of the materials.

We also recommend using dual-column types.

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ASTM D198 / Test procedure

Prepare your test specimen in accordance with the standard, noting all relevant histories of the treatment, conditioning, etc. of the wood specimen that

could affect its strength.

Adjust the flexure fixture in accordance with the specimen size and desired purpose of the testing.

Center point loading, and third-point loading are both available options.

Insert the test specimen into the flexure fixture.

Apply the flexure load to the specimen at the constant rate of speed defined in the standard.

Continue the test until failure, while recording load & deflection data at first failure, maximum load, and other points of sudden change.

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Measurements

Modulus of Rupture

Apparent Modulus of Elasticity

Various Others

*** Before conducting ASTM D198 , it is important to read the entire specification. Standards can be obtained from appropriate standard authorities.

 

***PARSROS  offers several types of grips and fixtures which will enable you to perform a variety of tests

  that are accurate and repeatable.