why fluactuation in my tensile test graph

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Patrick Oghate

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Oct 20, 2016, 12:19:37 AM10/20/16

to Materials & Welding

Dear Expats,

the attached graph is that of a tensile test carried out on 304 stainless steel rod of 12mm diameter. the steel is heat treated and quenched in water. please can anyone help explain why i have fluctuation in the graphs ( i mean the series of sharp decline in stress as shown in the graph)

kindly help....

Thanks for sharing.

Patrick Oghate