Modification of ASTM Standard E1681 on Environmental Cracking to Include Bolt-Load Specimen Testing.
ARMY ARMAMENT RESEARCH DEVELOPMENT AND ENGINEERING CENTER WATERVLIET NY BENET LABS
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Benet Laboratories experience with environmental cracking of cannon components has been combined with the technical expertise of various participants at ASTM technical meetings and symposia to develop a modification to ASTM Standard E1681. Test Method for Determining a Threshold Stress Intensity Factor for Environment Assisted Cracking of Metallic Materials Under Constant Load. A bolt-loaded compact specimen has been added to the standard to allow constant displacement bolt-load tests of environmental cracking threshold. Recent investigations of environmental cracking in two cannon systems are briefly summarized including cracking in acids used in the electroplating process and cracking due to cannon propellant gases. The modified draft of ASTM Standard E1681 is presented, including the additions to test procedure, apparatus, and stress intensity factor expressions required to perform bolt-load tests of environmental cracking threshold.