Stafford G D, Huggett R, Causton B E
J Biomed Mater Res. 1980 Jul;14(4):359-71. doi: 10.1002/jbm.820140403.
Two types of fracture toughness specimen, the tapered cleavage (TC) and single edge notch (SEN), are compared. Their reproducibility, accuracy, and ease of preparation are investigated. The fracture toughness of four types of acrylic resin, heat cured, autopolymerized, injection molded, and high impact resistant, has been determined by one or both of the above methods. High impact acrylic proved too ductile for either of the specimens to be used to assesss K1c; however, these deviations from brittle behavior were revealed by the tests and some insight into impact resistance was gained. The SEN specimens proved capable of distinguishing between the fracture toughness characteristics of the four types of denture base acrylics and proved easy to fabricate. The TC specimens proved difficult to fabricate requiring specialized equipment; however, once made, the specimens revealed more of the fracture process than did the SEN specimens.
对两种类型的断裂韧性试样，即楔形解理（TC）试样和单边切口（SEN）试样进行了比较。研究了它们的可重复性、准确性和制备的简易程度。通过上述一种或两种方法测定了四种类型丙烯酸树脂（热固化型、自凝型、注塑成型型和高抗冲型）的断裂韧性。结果表明，高抗冲丙烯酸树脂韧性过大，两种试样均无法用于评估K1c；不过，试验揭示了这些与脆性表现的偏差，并对其抗冲击性有了一定了解。SEN试样能够区分四种类型义齿基托丙烯酸树脂的断裂韧性特征，且易于制作。TC试样制作困难，需要专门设备；然而，一旦制作完成，TC试样比SEN试样能展现更多的断裂过程。
