Flexural strength

About: Flexural strength is a research topic. Over the lifetime, 52123 publications have been published within this topic receiving 846504 citations. The topic is also known as: bending strength & modulus of rupture.

A review of parameters influencing some mechanical properties of tungsten carbide–cobalt alloys

Abstract: The paper reviews experimental results relating to the influence of composition, structure, and testing conditions on the hardness, compressive strength, and transverse rupture strength of sintered tungsten carbide–cobalt alloys.

Fabrication and evaluation of carbon nano fiber filled carbon/epoxy composite

Abstract: In the present investigation, carbon nano fibers (CNFs) were infused into part-A of SC-15 epoxy (diglycidylether of bisphenol A) through a high intensity ultrasonic liquid processor and then mixed with part-B of SC-15 (cycloaliphatic amine hardener) using a high speed mechanical agitator. The trapped air and reaction volatiles were removed from the mixture using a high vacuum. DMA, TGA, and tensile tests were performed on unfilled, 1, 2, and 3 wt.% CNF filled SC-15 epoxy to identify the loading effect on thermal and mechanical properties of the matrix. The tensile results indicated that 2.0 wt.% CNF/epoxy resin showed the highest improvement in strength as compared to the neat systems. After that, the nanophased matrix with 2 wt.% CNF was then utilized in a vacuum assisted resin transfer molding (VARTM) set up with satin weave carbon preforms to fabricate laminated composites. The resulting structural composites have been tested under flexural loads to evaluate mechanical properties, and 22.3% improvement in flexural strength was observed in nanocomposite. Based on the experimental result, a linear damage model has been combined with the Weibull distribution function to establish a constitutive equation for neat and nanophased carbon/epoxy.

Increasing flexural capacity of reinforced concrete beams using carbon fiber-reinforced polymer composites

Abstract: A series of reinforced concrete beams strengthened in flexure using various carbon fiber-reinforced polymer (CFRP) composite systems were fabricated and tested in the lab to examine the effects of the strengthening configuration on the specimen behavior. The main aim was to find strengthening configurations to develop the strength of the composite laminates and preclude failure by debonding of the composite systems from the concrete surface. Results indicate that relying on the contact area between the composite laminates and the concrete surface is insufficient to eliminate debonding. Strengthening configurations involving techniques such as placement of transverse straps along the composite laminates or bonding the composites on the side surface of the specimens controlled debonding and provided a more ductile failure mode than placement on the bottom surface of the beams. Results of this investigation are intended to provide information required for the design of strengthening schemes of existing reinforced concrete bridges using composites.

Influence of filament winding parameters on composite vessel quality and strength

Abstract: An experimental design investigation of manufacturing and design variables that affect composite vessel quality, strength, and stiffness was conducted. Eight 20-in. cylinders (with one additional cylinder as a replicate) were manufactured and tested for hoop strength, hoop stiffness, fiber and void volume fraction distribution through thickness, residual stress, and interlaminar shear strength. Material and processing variables were divided into five categories: (a) resin, (b) fiber, (c) fabrication process, (d) design, and (e) equipment. Five variables were selected (from a list of 12) for study using a 1 4 fractional factorial design of experiment setup. The five variables were: (a) winding tension, (b) stacking sequence, (c) winding-tension gradient, (d) winding time, and (e) cut-versus-uncut helicals. Statistical analysis of the data shows that the composite vessel strength was affected by the manufacturing and design variables. In general, it was found that composite strength was significantly affected by the laminate stacking sequence, winding tension, winding-tension gradient, winding time, and the interaction between winding-tension gradient and winding time. The mechanism that increased composite strength was related to the strong correlation between fiber volume in the composite and vessel strength. Cylinders with high fiber volume in the hoop layers tended to deliver high fiber strength.