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Strain controlled tests were performed on 35 C8 steel specimens (IS 3930-1979) to determine cyclic stress-strain curve (CSSC) by Companion Specimens Test (CST), Multiple Step Test (MST) and Incremental Step Test (IST) procedures. A good agreement was found between the CSSCs obtained by CST and MST procedures. The CSSCs obtained by IST procedure using Incremental Step Loading Blocks (ISLB) of different maximum strain amplitude indicate that the parameters of CSSC depend on the maximum strain amplitude in the ISLB and resulted in a family of CSSCs. The dependence of CSSC parameters on the maximum strain amplitude in the ISLB are approximated by polynomials. Fatigue lives estimated based on IST results for irregular strain-time histories were found to be comparable with the experimentally evaluated fatigue lives.

There are many aspects of engineering integrity which require careful consideration during design, manufacture, operation and maintenance of the complex systems such as automobile. The ultimate realisation of the “goals of design” implies successful service during the entire life of the product. There is tremendous pressure to utilise lighter materials which results in fuel saving. Assessing the engineering integrity of components and systems under service conditions can be extremely complex and prognostic situation at design stage is often more difficult than the diagnostic one once failure has occurred. Review of various advanced techniques with case studies have been done for the safety and reliability of automobiles for Indian conditions.