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Cracking Energies
crack graph Energy /mJ 200 160 120 80 40 0 -40 -80 -120 -160 -200 4 8 12 16 20
crack length /mm
Surface Energy
Stress
Young's modulus
Increase the crack length with the slider below to see what happens.

Notice how a growing crack will not cause catastrophic failure if it is below the critical crack length.
However, as soon as it reaches the energy maximum, fast fracture will occur.