MaTestLab > Test Standards > ASTM D7774 Standard Test Method for Flexural Fatigue Properties of Plastics
Last updated 12th March 2025
ASTM D7774 Standard Test Method for Flexural Fatigue Properties of Plastics
ASTM D7774 test method detrmines the dynamic complete reversed fatigue properties of plastics in flexure, applicable to both rigid and semi-rigid plastics. This test method evaluates the effect of processing, surface condition, and stress on the fatigue resistance of plastic material subjected to flexural stress for large numbers of cycles. Stress and strain levels are kept below the material's proportional limit, ensuring relatively elastic strains and stresses. The ASTM D7774 test procedure utilizes three-point or four-point bending systems to ascertain these properties. Test frequency can be 1-25 Hz, but a frequency of 5 Hz or less is recommended . The results are used as a reference for selecting plastic materials for applications involving repeated flexural stress.
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ASTM D7774 Introduction
ASTM D7774 assesses the impact of processing, surface condition, stress, and fatigue resistance on plastic materials under flexural stress for numerous cycles. This test employs a frequency of 5Hz or lower. This test method assesses the dynamic complete reversed fatigue properties of plastics in flexure, applicable to both rigid and semi-rigid plastics. Stress and strain levels are kept below the material’s proportional limit, ensuring relatively elastic strains and stresses. The test employs a three- or four-point bending system to determine these properties.
ASTM D7774 Test Method
Procedure A
It is intended for materials utilizing three-point loading systems to determine flexural strength. This procedure employs a three-point loading system.
Procedure B
It is designed for materials using four-point loading systems to determine flexural strength. This procedure employs a four-point loading system.
D7774 Equipment and Sample Preparation
Specimen Detail
Specimen Size
The test frequency for ASTM D7774 can range from 1 to 25 Hz, but for optimal testing conditions, it’s advised to use a frequency of 5 Hz or lower.
D7774 Test Result and Interpretation
ASTM D7774 is utilized to assess the impact of plastic materials’ processing, surface condition, stress, and fatigue resistance when exposed to flexural stress over numerous cycles.
Service Name
Remarks
ASTM D7774 Testing
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Tests Related to ASTM D7774
ASTM D7774 is related to tests, including ASTM D618 for plastic conditioning, ASTM D790 for testing plastic tensile properties, and ASTM D792 for testing specific gravity and density of plastics.
Use of D7774 in Various Industries
It is used standard in the automotive, aerospace, construction, and consumer goods industries to evaluate the long-term durability of plastic materials under repeated flexural stresses, ensuring their performance and safety over time.
Materials Commonly Tested with D7774
The test for thermoplastics, thermosetting plastics, fiber-reinforced composites, and elastomers of standard is the fatigue behavior in flexible and endurance applications. Cyclic loading performance is evaluated for high-performance engineering plastics such as PC and ABS.
Common Challenges and Troubleshooting in D7774 Testing
There are challenges in testing due to equipment setup and material-specific issues. Proper alignment of the specimen and material properties can prevent an inaccurate result. Troubleshooting involves consistent testing environments, temperature and humidity control, and equipment calibration.
Safety and Best Practices in D7774 Testing
Testing requires handling specimens and equipment in the proper manner, wearing protective gear, maintenance, training personnel on specific requirements, and monitoring test environments to reduce errors caused by external factors.
Importance of D7774
It is an important test for plastic fatigue properties, providing a standardized method for cyclic loading assessment, guiding material selection and design decisions in industries requiring durability, and reducing failure risk.
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FAQ's
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Please contact us for a detailed quote for your astm d7774 testing needs. Cost incurred to carry out different astm d7774 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 d7774?
The required number of samples or specimens should comply with the procedure given in the astm d7774 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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How many days will it take to complete the astm d7774 test?
The turnaround time for astm d7774 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 d7774 tested?
You can share your astm d7774 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 d7774 test to various testing techniques.
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