In this paper, we investigate the intra-laminar size effect of discontinuous fiber composites (DFCs) with three different unidirectional prepreg platelet sizes (75×12, 50×8, and 25×4 mm). Experimentally, we test five different sizes of single edge notched specimens, geometrically scaled (1:2/3:1/3:1/6:1/20), with the constant thickness. We observe notch insensitivity meaning that the crack initiate away from the notch, when the structure sizes are small (from the ratio 1/20 to 1/6). However, the crack always initiate for the ratio of 2/3 and 1. Bazants size effect law is used to analyze such unconventional fracturing behaviors. The experimental results are fitted using the linear regression analysis follow by the size effect law. The transition behavior of the DFCs from the strength based criteria to the energy based criteria is clearly observed. Also, as the platelet size increases, the fracture behaviors shift away from the energy based criteria, which implies a decrease in brittleness. To obtain the intra-laminar fracture energy, G f , we have developed a finite element model based on the stochastic laminate analogy. The platelet size of 75×12 mm shows 96.8% increase in the fracture energy compared to the platelet size of 25×4 mm while behaves less brittle way. In conclusion, this study examines the effect of the platelet sizes of the DFCs in the presence of the notch. In this process, capturing the quasi-brittleness of the material using the nonlinear fracture mechanics is essential and we accomplish this using the simple size effect law. This work expands on an earlier SAMPE conference proceeding [1], and thus, there is a significant overlap in texts and figures between this and the SAMPE conference proceedings.

An efficient finite element method has been developed for the computation of time-dependent stress intensity factors for cracks of Mode I deformation infinite bodies. Quarter point elements are used near the crack tip to approximate the theoretical singularity. Problems considered herein are: the stationary crack subjected to transient loading conditions, and the rapidly propagating crack. The advantages inherent in this method with regard to accuracy and savings in computational costs are discussed.

UNSTRUCTURED Abstract Patient-centred medicine (PCM) involves looking at more than just a disease and how to treat it. It has evolved from the realisation that all patients are different physiologically, psychologically, emotionally, and socially, and it therefore encompasses all of these domains in its application. The mainstay of this approach is the promotion of a mutual relationship between patient and doctor that involves creating a secure environment to allow for open dialogue. By learning to listen to patients, and exploring other causes of disease other than physiological ones, doctors are able to provide a holistic approach to treatment. Patients are also actively encouraged to participate in the decision making process by adding their ideas, concerns and expectations. This negotiation allows for flexibility and individualisation of each treatment plan that is tailored to suit each individual patient. In essence, PCM encourages concordance: the agreement between doctor and patient on how to proceed towards a common goal. It is therefore important to teach medical students about PCM as early on in their medical education as possible. This will give them time to hone skills in communication so that they can better understand and explore their patient’s circumstances as well be aware of other domains that may require support. But how can medical schools effectively teach their students PCM? Here we suggest the use of expert patients as a beneficial method for promoting PCM in medical school curriculums as students have the opportunity to gain first hand knowledge of what a patient with a specific disease actually feels, what impact it has on their lives and those around them, and what support they find lacking or useful. Encourage medical curriculums to incorporate expert patients as a resource of information to teach future doctors abotu patient-centred medicine and its holistic objectives.