Advanced Materials Research Vols. 887-888

Abstract: The effects of the impact energy on the impact damage of CFRP laminates were studied in this paper. Impact tests for the CFRP laminates with the size of 600 mm×700 mm were subjected to different the impact energy levels from 5 J to 50 J. The matrix length was investigated according to different energy levels. The experimental results reveal that the crack length increases linearly with the increasing impact energy. The impact damage of CFRP laminates tends to be more severe as impact energy increases, and the impact area and crater depth increases with increasing impact energy. The surface of impact dent of specimen looks like W shape.

Abstract: The temperature effects on the ultimate strength of 93WNiFe alloy have been investigated systematically through tensile tests, fracture surfaces and microstructure. The temperature ranges from 10 to 900 degrees. The results show that the ultimate strength decreases with the increase of temperature, and there is a platform in 300 to 600 degrees .The deposition has been observed in fracture surfaces from 500 to 600 degrees. The fracture modes influence the ultimate strength,deposition can improve mechanical properties of W-W and W-M interfaces, it is the cause of the ultimate strength platform.

Abstract: The shoe board emphasizes the strength and the bear to fold especially, so it chooses the long fiber raw material. The experiment confirms optimal beating condition and formula through the analysis of beating of the jute pulp and the softwood (Larch) pulp and a series of condition experiment. The board raw material category is: jute: softwood = 7:3; Jute: 40 oSR, softwood: 30 oSR. The properties of original board are: breaking length: 6115 meters, index: 15.79mN·m²/g, fold endurance: 2125 times.

Abstract: The cellulose based pressboards from four well-known suppliers in China, which areChangzhou HuaDian Insulation Material Co., Ltd (HD), TaiZhou XinYuan Electrical EquipmentCo., Ltd (XY), Hunan GuangXin Electrical Technology (GX) and ShangHai YaZhong TradeDevelopment Co., Ltd (YZ) were analyzed and compared. The guarantee value of Figeholm’spressboard was taken as a reference. Mechanical results show that most pressboards have excellenttensile, compressive and flexural properties except for YZ pressboards. The ply adhesion was alsostudied by simple loading method to verify the bonding effect and only XY pressboard show nosliding. Electrical results show that all pressboards have a similar electrical strength while HD andXY pressboards show relatively lower dissipation factor value. Based on the mechanical andelectrical performance, XY pressboards are considered to be better as compared to others andcompetitive to Figeholm’s products.

Abstract: In this article, an analytical dependence of distribution of elasticity modulus across the thickness of the cylinder loaded with internal pressure p, at which the equivalent stresses according the Mohr failure criterion are the same at all points. The problem is solved for the cases of plane strain state and plane stress state in the elastic formulation.

Abstract: This paper studied the fatigue behavior of the near alpha titanium alloy TA11 under multiaxial loading conditions with tension - bending vibration, to simulate the service stress state applied on the engine blades, where a large centrifugal force is superimposed with bending vibration loads. A plate-like specimen was used in the fatigue tests with different ratios between the tension and bending vibration loads, then, the energy based fatigue criteria were applied for correlation of the test results. The fatigue properties of titanium alloy TA11 under the specialized loading conditions are characterized and discussed.

Abstract: In order to study the damage and sptial spatial and temporal distribution of acoustic emission of rocks under uniaxial cyclic load-unload, test of rocks with various kinds of heterogeneity under uniaxial cyclic load-unload disturbance was conducted using numerical simulation software RFPA2D.Figure destruction and acoustic emission - load curve of rocks were obtained from the test.The results show that destroy of the rock was produced from tensile stress concentration area surrounding the hole. as the load increases,crack developmented to the edge of the rock.when homogeneity of rock was low, crack development with irregularity due to defects of rocks. with the increasing homogeneity of rock, damage evolution mode under uniaxial cyclic load-unload disturbance transition from ductile to brittle.damage evolvement process can be responsed by acoustic emission. with the increasing homogeneity of rock. The maximum number of acoustic emission Continuously improve and exhibit unexpected. Kaiser effect of acoustic emission under cyclic loading is significantly This template explains and demonstrates how to prepare your camera-ready paper for Trans Tech Publications. The best is to read these instructions and follow the outline of this text. .

Abstract: In this paper, alanine which was homologous with wool fibers and the crosslinker glutaraldehyde were used to consolidate fragile wool fabrics. As a bifunctional crosslinker, glutaraldehyde can react with amine groups both in wool and alanine. With glutaraldehyde crosslinking at different concentrations, the breaking strength, molecular structure and surface morphology of the wool were investigated. As a consequence, the consolidation with alanine and glutaraldehyde led to a positive effect on the mechanical properties of fragile wool fabrics, resulting in increased breaking strength. However, the results of SEM and FTIR showed that the consolidation had no obvious influence on the morphology and chemical structure of fragile wool fabrics.

Abstract: This study investigates the influence of temperature and load on the dry sliding property of interface between brake friction material with low metallic formulation and gray cast iron disc. Full factorial design was employed to conduct pin-on-disc wear tests to attain wear and friction response under external heating temperature and applied load ranging from 25-175°C and 50-500N(0.35-3.5MPa), respectively. The analysis of experiment results shows the effect of load on wear rate is almost linear. Wear rate exhibits an increase followed by decrease trend with applied load. Friction coefficient is positively affected by external heating temperature but almost independent of applied load. Quadratic regression is conducted to fit the influence of temperature and load on wear rate and friction coefficient and the result shows sound fitting effect.

Abstract: Nomex (Aramid 1313) is the best high temperature resistant high-tech new materials in the world today. In this paper, Nomex was treated in the experiment of high temperature, low temperature, high and low temperature conditions. The results show that the high temperature affects the strength and breaking elongation for nomex fiber. Low temperature and high & low temperature cycle does not affect much on the strength and breaking elongation.