Lecture 26 MANE 4030 Final Week Bagepalli - Professor Bharat Bagepalli Spring 2015 Example Through-Thickness Crack Static Loading Steel tension strips

# Lecture 26 MANE 4030 Final Week Bagepalli - Professor...

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Example Through-Thickness Crack, Static Loading © Professor Bharat Bagepalli Spring 2015 Steel tension strips are use to reinforce a bulkhead structure. The manufacturer initially wanted to use two (2) strips of A 538 Steel to carry a load total load F shared equally by each strip. They later came up with the idea of using a single AISI 4340 Steel strip of twice the thickness but the same width to carry the same load, to potentially save money. The chances of finding a through crack, length 2a is the same in each case. F 538 Two Strips A 538 Steel Single Strip AISI 4340 Steel F 538 F 538 F 538 F 4340 F 4340 Given: F 4340 = 2*F 538 B 4340 = 2*B 538
Assume static loading, for each case, use Table below for Material property and Loading, and Graph for finding C. a)Factor Of Safety in Large Scale Yieldingb)Stress Intensity factor Kc)Appropriate Fracture Toughness (Plane Stress or Plane Strain as appropriate)d)Factor Of Safety for Crack growthFor Each of the Two Situations, Find: Figure 5.17 C (1−a/b) Steel A538 AISI 4340 Plate Width, 2b, m 0.15 0.15 Each Plate Thickness, B 538 or B 4340 , m 0.01 0.02 Through-Thickness Crack size, 2a, mm 3 3 Load per Strap, B 538 or B 4340 , N 550,000 1,100,000 Yielld Strength, Sy, MPa 1647 470 Ultimate Strength, Su, MPa 1696 745 Plane Strain Fracture Toughness, K1c, MPa-m^(1/2) 46.2 50 % Elongation on 50mm sample 13 36