The fracture behaviour of a specific material, semi-crystalline biobased polymer, was here studied. Dynamic tests on strip band specimens were carried out. Fracture surfaces observed at different scales by optical and electron microscopy to describe cracking scenarios. Crack initiation, propagation arrest zones described. Three distinct are highlighted in the initiation zone: zone with conical ...

In the current paper, a low-Si aluminium alloy (1.4-2.4% Si) was used to fabricate a complex shape telecom component using Semi-Solid High-Pressure Die Cast (SSM-HPDC), process. Microstructure and fracture characteristics were investigated. The cast material exhibited microstructural inhomogeneity, in particular macrosegregation in the form of liquid surface segregation bands in addition to sub...

This in vitro study examined the effect of surface defects on cutting blades on the extent of the cyclic fatigue fracture of HEROShaper Ni-Ti rotary files using fractographic analysis of the fractured surfaces. A total of 45 HEROShaper (MicroMega) Ni-Ti rotary files with a #30/.04 taper were divided into three groups of 15 each. Group 1 contained new HEROShapers without any surface defects. Gro...

We used fracture-label and surface labeling techniques to characterize the distribution and topology of wheat germ agglutinin (WGA) receptors in the plasma membrane of boar sperm heads. We show that freeze-fracture results in preferential, but not exclusive, partition of WGA-binding sites with the outer (exoplasmic) half of the plasma membrane. Labeling of the inner (protoplasmic) half of the m...

Distal ulna fractures often concomitantly occur with distal radius fractures, and their treatment method is still controversial. We hypothesized that osteosynthesis is not necessary for distal radius fracture-associated distal ulna fracture without DRUJ surface fracture. In this study, non-operative treatment was selected for fractures not extending to the distal end of the ulna of the DRUJ bas...

Avulsion fracture at the site of attachment of the coracoid process of the coracoclavicular ligament (CCL) is extremely rare. We presented three adult cases of this unusual avulsion fracture associated with other injuries. Case  1 was a 25-year-old right-handed male with a left distal clavicular fracture with an avulsion fracture of the coracoid attachment of the CCL; this case was treated surg...

Motivated by observations of the subglacial drainage of water, we consider a hydraulic fracture problem in which the crack grows parallel to a free surface, subject to fully turbulent fluid flow. Using a hybrid Chebyshev=series-minimization numerical approach, we solve for the pressure profile, crack opening displacement, and crack growth rate for a crack that begins relatively short but eventu...

in recent years, more attention is paid to stainless steel 316l as fracture plate and fixation in human's body. present studies are focused on surface and metallurgical properties of this material. biocompatibelity of this material and its superior mechanical properties has made it the most demanded biomaterial. in this research, four different implants are investigated in three stages. four co...

The surface ultrastructure of lymphocytes during capping of two transmembrane proteins is shown. As seen by fracture-flip the plasma membranes of human lymphocytes are covered by a high density of surface particles. Incubation in 30% glycerol leads to aggregation of these surface particles. Immunogold labelling shows that the transmembrane proteins bearing HLA class I and CD4 antigens are confi...