MaTestLab > Test Standards > ASTM D732 Standard Test Method for Shear Strength of Plastics by Punch Tool
Last updated 10th March 2025
ASTM D732 Standard Test Method for Shear Strength of Plastics by Punch Tool
This test method, ASTM D732, focuses on the punch-type shear test and is designed for assessing the shear strength of test specimens made of organic plastics, including sheets and molded disks. Shear strength, determined through a punch tool, is a recognized approach for comparing materials and gathering engineering design data. It's important to note that while this method provides valuable insights, it may only encompass some factors present in real-world applications, such as stress-concentrating geometries and shear rates, which can significantly impact shear strength.
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ASTM D732 Introduction
The ASTM D732 Shear Strength Test determines the force required for a plastic or film to puncture when compressed between two metal edges. These shear strength values play a crucial role in the design of film and sheet products subject to shear loads and in applications where concerns revolve around applied crushing loads.
ASTM D732 Test Method
Clamping Specimen
The ASTM D732 test procedure involves securing a test sample, connected to a 1-inch punch, between two metal fixtures using clamps.
Punching
Following this setup, a male punch is applied into the hole in the metal fixture, initiating shear stress around the sides of the hole.
Universal Testing Machine
Subsequently, a universal testing machine exerts force on the punch until the sample undergoes shearing, thus determining its shear strength.
D732 Equipment and Sample Preparation
Specimen Detail
The ASTM D732 Shear Strength Test determines the force required for a plastic or film to puncture when subjected to shear stress between two metal edges.
Specimen Size
Samples for the ASTM D732 test are either 2-inch-diameter disks or 2-inch-squared plates, with thicknesses between 0.05 and 0.5 inches. Each sample is drilled with a 7/16th inch hole at its center for fixture placement.
D732 Test Results and Interpretation
ASTM D732 serves as a standardized method for comparing the shear performance of materials and obtaining essential engineering design data
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Tests Related to ASTM D732
ASTM D732 is related to tests including ASTM D618 for plastic conditioning, ASTM D4000 for specifying plastic elements, and ASTM E4 for identifying the load of testing machines.
Use of D732 in Various Industries
It is a widely used standard within industries such as aerospace, automotive, construction, and consumer goods. It evaluates the strength and load-carrying capability of plastic components within structural applications, panels, insulation, and load-carrying installations.
Materials Commonly Tested with D732
The standard tests thermoplastics such as polycarbonate, polyethylene, and acrylic, as well as thermosetting plastics like phenolics and epoxies, for structural applications and quantifying their shear properties under specific loading conditions.
Common Challenges and Troubleshooting in D732 Testing
Testing faces challenges such as improper specimen preparation, misalignment of punch tool, and variations in fixture clamping pressure, which lead to inconsistent results or premature specimen failure. Troubleshooting involves precise specimen dimensions, alignment verification, and equipment calibration.
Safety and Best Practices in D732 Testing
Testing safety involves special care in handling punch tools by proper fixture setup, wearing PPE, following manufacturer’s guidelines to prevent accidents and ensure a proper fixture setting and functioning.
Importance of D732
It is one of the most important tests regarding the mechanical reliability of plastics in critical applications; they help manufacturers choose the correct materials, optimize designs, and work according to industry standards in a way that increases the safety and performance of plastic products with longer life.
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FAQ's
Where can I get the astm d732 tested?
You can share your astm d732 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 d732 test to various testing techniques.
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Please contact us for a detailed quote for your astm d732 testing needs. Cost incurred to carry out different astm d732 testing methodology depends on the type of raw material; number of samples, coupons, or specimens; test conditions, turn around time etc. Costs of some ASTM testing methods start from $100 and the final value depends upon the factors listed above. Please contact us for the best and latest prices.
How many samples are required for astm d732?
The required number of samples or specimens should comply with the procedure given in the astm d732 standard. However, the MaTestLab operations team can assist you for your special requirements once you share your testing details with us.
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MaTestLab has a vast testing laboratory network, hence we bring you the best testing facilities in a cost-effective way. We offer considerable discounts (15-20%) to our returning customers based on test volume and frequency.
How many days will it take to complete the astm d732 test?
The turnaround time for astm d732 test methodology depends upon the test procedure mentioned in the standard test document. However, we at MaTestLab understand your research requirements and hence try to get your test completed within the least possible time.
Where can I get the astm d732 tested?
You can share your astm d732 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 d732 test to various testing techniques.
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