The fracture performance of axisymmetric notched samples taken from pearlitic steels with different levels cold-drawing is studied. To this end, a real manufacture chain was stopped in the course process (on-site factory), and all intermediate stages were extracted initial hot-rolled bar (not cold-drawn at all) to final commercial product (prestressing steel wire). Thus, drawing intensity or st...

Article describes methods and results of experimental research for strain behavior, crack formation fracture concrete beams reinforced with fiber polymer (FRP) bars during bending moment action. 18 (3+3 series) glass FRP (GFRP) basalt (BFRP) 6, 10 14 mm in diameter were tested. Deflection the middle beam, ultrasonic transmission time 4 routes measured tests besides visual inspection. Main occur...

Crack deflection is often used as evidence of substantive fracture toughness in both natural and synthetic composites. The associated microstructures these tough composites are highly anisotropic, exhibiting easy hard directions for crack propagation. Cracks generally deflect away from to propagate instead tying the overall its weak axis. Instead, enhanced can be realized when cracks forced alo...

the prevalent method of irrigation in paddy fields in iran is continuous ponding, which changes to intermittent method at the time of water shortage. soil cracks are the main problem in intermittent irrigation. in this study, effects of adding rice straw on some soil physical characteristics and cracks were studied in paddy soils of the guilan province of iran. the experiment was performed as s...

A novel method for preparing and testing bending specimens in-situ the TEM has been developed. This method provides high visibility of the crack front and its associated plastic zone. This is significant because energy release rates can now be calculated at many points throughout the test based on crack tip opening displacement (CTOD), crack opening angle (COA), and crack advance. Further refin...