Abstract
An attempt has been made to discuss the design criteria of the materials for the use in high vacuum technology. The present work support this and concludes that fractur behaviour of soft soldered composite laminates with crack divider geometry made from 4340 steel in high vacuum atmosphere at different strain rates does not remain same under plane strain conditions. This is supported by the load-displacement graph by using Instron testing machine and the fractography which support the same modes of failure during fracture process. Thus confirming the higher KIc values at slower rates and suggesting the economical use of the high strength materials in the space exploration research programme.
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