ASTM D6068 Standard Test Method for Determining J-R Curves of Plastic Materials

ASTM D6068 is used to determine J-R curves of plastic materials. J-R curves are crucial in characterizing the fracture toughness of materials, particularly plastics, used in various industries. It involves subjecting the plastic specimen to a constant load or displacement rate and measuring the corresponding crack opening displacement.The J-R curve obtained from the ASTM D6068 test provides valuable information about the material's resistance to crack propagation.


Introduction to ASTM D6068

ASTM D6068 involves the determination of the J-integral versus crack growth resistance (J-R) curves for polymeric materials. It describes a multiple specimen method that requires optical measurement of crack extension from fracture surfaces. The values stated in SI units are to be regarded as the standard.

ASTM D6068 is highly significant in terms of the applicability of the J-R curve produced by this method.  The J-R curve identifies crack growth resistances in tough polymers and blends by enabling valid characterization using linear elastic fracture mechanics.

ASTM D6068 Test Procedure 

Specimen SelectionIn testing, the largest specimens available are used  to capture a greater portion of the J-R curve and achieve a more conservative estimation of crack growth resistance. 
Test Setup and ExecutionIt involves preparing pre-cracked specimens according to specifications. Initial measurements are taken to ensure compliance. Loading conditions are applied, and load-displacement data is recorded. The test continues until the desired crack extension is achieved. Critical values for crack length, load, and displacement are recorded. J-R curves and crack growth resistance parameters are calculated. 

ASTM D6068 Test Specimens 

Specimen DetailsThree-point bend and pin-loaded compact tension are the most reliable specimens which have constant proportionality in-plane dimensions.
Specimen dimensionsASTM D6068 recommends specifying the dimensions of the specimens based on the material being tested and the desired objectives.

ASTM D6068 Test  Results 

The J-R curve obtained from the ASTM D6068 provides valuable information about the material’s resistance to crack propagation, helping engineers and material scientists assess the fracture toughness of plastics. It is widely used in industries allowing manufacturers to evaluate the suitability of plastic materials for specific applications and make informed decisions regarding material selection and design.

Tests Related to ASTM D6068 Important relevant tests to ASTM D6068 include ASTM E1820 for determining fracture toughness, ASTM E399 for testing plane-strain fracture toughness, and ASTM E1823 for measuring J-R curves. These tests provide essential data on crack growth resistance and fracture behavior of metallic materials.


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The turnaround time for astm d6068 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 d6068 tested?

You can share your astm d6068 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 d6068 test to various testing techniques.

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