The purpose of fracture toughness testing is to determine the value of the critical stress intensity factor, or plane strain fracture
1/2], respectively the plane strain fracture
The maximum circumferential strain fracture
criterion for mixed mode of concrete, The Journal of Northwest Agriculture University 27(1): 43-46.
McClintock and Leguilon [3, 4] offered strain fracture
criteria when plastic zone at crack tip is taken into account and stresses [[sigma].
Unfortunately PE--like many thermoplastics--also has relatively little resistance to plane strain fracture
at crack speeds, exceeding 100m/s and temperatures below 0[degrees]C.
5-8), compact specimens with cracks were used to measure the plane strain fracture
Whilst strength and the stability of drawing determine the energy per unit volume of material in a relatively simple way (it is their product), the contribution of this energy to total fracture resistance must depend on the ability of plane strain fracture
resistance: this must be large enough to generate a large (high volume) plane-stress plastic zone.
International Standard ISO 17281 defines a fracture mechanics test capable both of evaluating plane strain fracture
resistance at up to 1 m/s and of precisely resolving a transition temperature.
For the plain strain fracture
toughness tests, single edge notched bend specimen of 44 X 10 X 5 mm were used.
The plane strain fracture
toughness of two ductile polymers, ultra high molecular weight polyethylene (UHMWPE) and acrylonitrile-butadiene-styrene (ABS), was measured by using the essential work of fracture approach.
IC] as the plane strain fracture
toughness was evaluated using (31)
This is a plane strain fracture
toughness value because the required specimen thickness for plane strain: