Effects of material properties and mismatch on unified constraint parameter

Correlation between fracture toughness and constraint of bi‐material interfaces with different mechanical mismatches

“…The reason for this is that the m and m ref calculated from the J‐ CTOD lines (Figures 10 and 11) change simultaneously with the change of M or Δn , while their ratio A d * = m ref / m is nearly unchanged. This result is in agreement with that in the authors' recent study, 51 which has shown independence of A d * on material properties and strength mismatch for cracks in plates. This advantage of A d * is beneficial to develop its solutions for cracked structures and its engineering application 51 …”

“…The m and m ref are mainly related to geometric constraint and material properties, but their ratio (i.e., A d *) in Equation ( 4) may be independent of material properties. This has been proved in a recent work of authors 51 that the parameter A d * is independent of strength mismatch in welded joints and material properties in homogeneous components. The advantages of A d * mainly include its capability of characterizing both constraints and its independences on load, material properties, and strength mismatch.…”

“…The advantages of A d * mainly include its capability of characterizing both constraints and its independences on load, material properties, and strength mismatch. These advantages facilitate developing A d * solutions for cracked structures (including welded structures), establishing the correlation between fracture properties of materials and A d *, and engineering application of A d * 40,41,50,51 . By using Equation (4), the A d * value can be calculated.…”

“…This advantage of A d * is beneficial to develop its solutions for cracked structures and its engineering application. 51…”

“…A general quantitative correlation equation between the master curve reference temperature T 0 ( T 0 is a parameter for characterizing cleavage fracture toughness) and A d * has been established 50 . In the latest study of authors, 51 it has been shown that the A d * is basically independent of material properties and strength mismatch for cracks in welded and homogeneous plates. These characteristics of A d * facilitate developing its solutions for welded and homogeneous structures.…”