ASTM D747 Standard Test Method for Apparent Bending Modulus of Plastics using a Cantilever Beam (Withdrawn 2019)
ASTM D747 was a standard procedure to measure the apparent bending modulus of plastics through a cantilever beam method. The test was devised to assess the flexibility of plastics at flexural loading by using a specimen on which a bending load is exerted as the specimen is held at a particular distance from a supported point. Despite having been withdrawn in 2019, this test was formerly very common as a means of determining material rigidity and comparative flexural behavior of different plastics, particularly in terms of quality control and material selection. Its retraction implies the embrace of superior or standardized methods, yet it has been serious in historically testing scenarios.
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ASTM D747 Introduction
ASTM D747 was set to determine the apparent bending modulus of plastics using the cantilever beam method. This was a relatively simple procedure to determine the relative stiffness of plastics, even though it did not necessarily lead to accurate values of elastic modulus. Plastic flexural properties are essential in the evaluation of plastics in terms of performance for load-bearing purposes. The test was particularly helpful in test materials with moderate and high stiffness, where deformations due to the load taken had to be measured even in small amounts. It was significant in that it provided standardized information to design engineers, people who supplied materials, and product manufacturers.
ASTM D747Test Method
Specimen Preparation
A rectangular plastic specimen of defined dimensions was prepared with smooth, uniform edges.
Mounting
The specimen was clamped at one end to act as a fixed support.
Loading
A force was applied downward at a specified distance from the clamp.
Measurement
The resulting deflection was recorded under the applied load.
Calculation
The apparent bending modulus was calculated from the relationship between load, span length, deflection, and specimen geometry.
Equipment and Sample Preparation
Specimen Details
Flat, rectangular plastic samples cut to specified dimensions.
Specimen Preparation
Specimens machined or molded to size with smooth, defect-free surfaces to avoid stress concentrations.
Specimen Dimensions
Typically, a length several times the thickness, with uniform cross-section; exact dimensions are standardized for test validity.
ASTM D747 Results and Interpretation
The findings were in the form of apparent bending modules, which are the resistance to bending in the material under load. Because the test measured stiffness subject to small deformations and not the actual flexural modulus, the values were termed “apparent.” The materials with high values of modulus represented higher values of stiffness and rigidity, whereas lower values described flexible plastics. Results were compared with those of other plastics or tracking consistency of production batches in general.
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ASTM D747 Related Test Methods
ASTM D790 is the most used standard test method to determine flexural properties of unreinforced and reinforced plastics; it does this by giving the actual flexural modulus under a three-point or four-point loading system. Tensile properties of plastics by ASTM D638 are also applicable, since other values of modulus obtained via tensile testing can be observed to line up with flexural performance.
ASTM D747 Applications in Industry
Before withdrawal, this method found use in those industries where rapid comparison of plastic stiffness was necessary, including use in packaging, consumer goods, and rough material screening. Preliminary testing of new plastic formulations was especially valued for the variety of methods applied in research and development. In production, it helped establish quality controls by ensuring a certain level of rigidity in production batches.
ASTM D747 Materials Commonly Tested
The technique was generally applied in thermoplastics and thermosetting plastics that had some rigidity, medium, and high. Typical materials tested were polystyrene, acrylics, nylon, phenolic resins, and polycarbonate.
ASTM D747 Common Challenges and Troubleshooting
Among the problems that were frequently encountered, one was that of precise clamping since any movement of slip or improper alignment at the fixed position may significantly impact the outcomes. Preparation of the specimen also demanded some accuracy because edge faults or non-uniform thickness led to stress concentration and dissimilar measurement of deflection. The soft plastics may experience such big deflections that would surpass the working range of the test, hence giving questionable results.
ASTM D747 Safety and Best Practices
Appropriate safety precautions involved making sure specimens are fastened well to prevent falling, as well as proper orientation of the loading device to reduce abrupt breakdown. It was recommended that the operators avoid damaging the specimen during preparation, causing scratches or surface flaws, which would distort outcomes. This was achieved through regular calibration of the measuring equipment that guaranteed regularity in the results obtained regarding modulus.
Importance of ASTM D747 Test Method
Even though this method was withdrawn in 2019, it has some significance since it was one of the first standardized methods used to assess the stiffness of plastics. It served as an easy and convenient method, offering a relatively quick and straightforward way to compare the material, and it preconditioned more accurate methods of testing. This method could still serve as a source of reference for historical research on the topic, comparisons of legacy data, and even in education, given that it is based on the standards they developed.
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You can share your astm d747 testing requirements with MaTestLab. MaTestLab has a vast network of material testing laboratories, spread across the USA and Canada. We support your all material testing needs ranging from specific astm d747 test to various testing techniques.
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