The fatigue behaviors of two SiC/[SiC+Si 3 N 4 ] ceramic matrix composites (CMC) were investigated at 1,300°C in laboratory air and in steam. Composites consisted of a crystalline [SiC+Si 3 N 4 ] matrix reinforced with either Sylramic™ or Sylramic-iBN fibers (treated Sylramic™ fibers that possess an in situ BN coating) woven in a five-harness satin weave fabric and coated with a proprietary boron-containing dual-layer interphase. The tensile stress-strain behaviors were investigated and the tensile properties measured at 1,300°C. Tension-tension fatigue behaviors of both CMCs were studied for fatigue stresses ranging from 100 to 180 MPa. The fatigue limit (based on a run-out condition of 2×10 5 cycles) in both air and steam was 100 MPa for the CMC containing Sylramic™ fibers and 140 MPa for the CMC reinforced with Sylramic-iBN fibers. At higher fatigue stresses, the presence of steam caused noticeable degradation in fatigue performance of both composites. The retained strength and modulus of all run-out specimens were characterized. The materials tested in air retained 100% of their tensile strength, while the materials tested in steam retained only about 90% of their tensile strength.
The Bismuth Layered Ferroelectrics (BLF's) BaBi4Ti4O15 and SrBi4Ti4O15 were synthesized using solid-state-reaction technique and the impact of `thermal etching' on microstructure, dielectric and ferroelectric properties was thoroughly investigated. The phase...
Use of natural fibres as reinforcement in polymeric composites has been increased during last few decades. They are potential alternatives to synthetic fibres due to their excellent properties like light in weight, biodegradable, abundant, satisfactory strength etc. Various parts of automobiles are being made by natural fibres that improved fuel efficiency and reduced emissions. The present study focuses on developing new polymer composites by reinforcing walnut shell particulate on the basis of different weight fractions. Mechanical characterization was done for the developed composites which include evaluation of tensile strength, impact strength and hardness. Different weight fractions of walnut shell particulate were used including 0%, 10%, 15% and 20%. Maximum tensile strength was achieved in case of 10% walnut shell reinforced composites. Maximum impact strength and hardness were achieved in case of 20% and 15% reinforcement respectively.
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