MaTestLab > Test Standards > ASTM D5528 Standard Test Method for Mode I Interlaminar Fracture Toughness of Unidirectional Fiber-Reinforced Polymer Matrix Composites
Last updated 14th March 2025
ASTM D5528 Standard Test Method for Mode I Interlaminar Fracture Toughness of Unidirectional Fiber-Reinforced Polymer Matrix Composites
ASTM D5528 details how to measure the Mode I interlaminar fracture toughness (GIc) of continuous fiber-reinforced composite materials using the double cantilever beam (DCB) specimen. It's designed for composites with specific materials like unidirectional carbon fiber and glass fiber tape laminates with single-phase polymer matrices, considering differences in matrix toughness. Though it may be helpful for other composites, its use is restricted due to observed interferences, as informed by past testing experiences.
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ASTM D5528 Introduction
ASTM D5528 outlines determines interlaminar fracture toughness (GIc) using the double cantilever beam (DCB) specimen for specific composite materials like carbon and glass fiber laminates with certain polymer matrices. Although it could apply to other composites, its effectiveness is limited based on previous testing experiences. MaTestLab is one of the best testing service providers, with the best network of testing laboratories in the USA to carry out ASTM D5528 tests for our clients. Additionally, ASTM D5528 helps establish design allowances for damage tolerance analyses of composite structures made from such materials.
ASTM D5528 Test Method
Block loading is at the top and bottom of the sample
The sample edges near the insert are marked, and load blocks are bonded to each sample end’s top and bottom surface using a room-temperature cure adhesive. It is ensured that the load blocks can withstand the maximum expected load.
Mounting of optical microscope
During ASTM D5528 testing, a microscope is used to watch the delamination. The load is applied steadily unless delamination increases by 3 to 5 mm. Load and displacement are recorded regularly.
Recording delamination length
The delamination length is marked on the sample’s side, and data points are added to the load-displacement curve if delamination starts visually.
Unloading of sample
The sample is unloaded at a steady speed of 25 mm/min, with data on load and displacement recorded. Also, the position of the pre-crack tip is marked on both edges.
Reloading of sample
Next, the sample is reloaded at the same initial speed of 1 to 5 mm/min, and again, the load and displacement data are recorded continuously.
D5528 Equipment and Sample Preparation
Specimen Detail
The ASTM D5528 test determines continuous fiber-reinforced composites’ opening Mode I interlaminar fracture toughness.
Specimen Size
ASTM D5528 typically requires a sample length of at least 127 mm (5.0 inches), a laminate thickness of 3 to 5 mm (0.12 to 0.2 inches), and a width between 20 and 25 mm (0.8 to 1.0 inches).
D5528 Test Result and Interpretation
ASTM D5528 is a key standard for evaluating mode I interlaminar fracture toughness in unidirectional fiber-reinforced polymer matrix composites. It provides essential insights into material resistance, aiding in design and quality assurance decision-making.
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ASTM D5528 Testing
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Tests Related to ASTM D5528
ASTMD5528 is related to tests including ASTM D883 for plastic-related terminologies, ASTM D2651 for the preparation of metal surfaces, and ASTM D2734 for the void content of reinforced plastics.
Use of D5528 in Various Industries
It is used in automotive, wind energy, and marine engineering industries for the assessment of interlaminar fracture toughness of unidirectional fiber-reinforced polymer matrix composites to ensure resistance to delamination under tensile loading.
Materials Commonly Tested with D5528
The test method measures the fracture toughness in polymer composites such as carbon fibre reinforced epoxy, GFRP, Kevlar composites, among others, that are mostly used in high performance applications for lightweight strength materials.
Importance of D5528
It is the standard test method for Mode I interlaminar fracture toughness that is essential in performance prediction, delamination resistance, safety, and longevity under complex stress environments. Manufacturers utilize the test method to validate the quality of composites and provide quantitative benchmarks for material development.
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The required number of samples or specimens should comply with the procedure given in the astm d5528 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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The turnaround time for astm d5528 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 d5528 tested?
You can share your astm d5528 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 d5528 test to various testing techniques.
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