PSI - Issue 60

Ganesh Nigudage et al. / Procedia Structural Integrity 60 (2024) 678–689 Ganesh Nigudage / Structural Integrity Procedia 00 (2023) 000 – 000 (Fe proj )= F( ) (Enrico Lucon et al., 2020). 2. Fe (int) - It is force value corresponding to intersection of two tangents on force-displacement curve which are determined at the start of the test (v = 0) and at the point where v = h o . The intersection point between the two linear tangents is then used for determining F e (Enrico Lucon et al., 2020). 3. F ho/10 - Alternative to bilinear methods offset methods are used by some authors. F ho/10 is the force value obtained after intersection between force-displacement curve and straight line parallel to initial linear portion with an offset of h o /10 or 0.05mm (Enrico Lucon et al., 2020). 4. F 0.1mm, offset – It corresponds to force value obtained after intersection between force-displacement curve and straight line parallel to initial linear portion with an offset of 0.1 mm (Enrico Lucon et al., 2020). The above characteristic force parameters on load-displacement plot are shown in inset of Fig.4. 683

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Fig. 4. Characteristic small punch forces that are used for correlating with Yield strength .

3.1.2. Characteristic small punch forces used to correlate with tensile strength 1. Maximum force (F m )- It is the maximum force in the small punch test and the corresponding value of punch displacement is v m . 2. F 0.48mm - It is force value corresponding to punch displacement of 0.48mm. 3. F 0.65mm - It is force value corresponding to punch displacement of 0.65mm (Enrico Lucon et al., 2020). The above SP forces on load - displacement plot are shown in Fig. 5.

Fig.5. Characteristic small punch forces that are used for correlating with Tensile strength