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粘贴碳纤维片材加固技术是一项新的应用外粘高性能复合材料加固结构的技术．碳纤维片材重量轻、高强度、高弹性、高耐久性，易于施工，现已开始应用于各类混凝土结构的加固处理．本文根据工程实际情况，简要介绍了碳纤维片材加固技术在混凝土框架梁抗剪加固工程中的应用． 相似文献
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WANG Yan-lei HAO Qing-duo OU Jin-ping 《重庆大学学报(英文版)》2007,6(3):221-226
In-plane shear properties of composite material laminates are very important in structural design of composite material. Four commonly used in-plane shear test methods were introduced in this paper. In order to study the differences of various shear test methods, two ASTM standard in-plane shear test methods for composite material laminates were experimentally investigated. They are ±45° tensile shear test (ASTM D3518) and V-notched rail shear test (ASTM D7078). Five types of composite material laminates composed of E-glass fiber fabric and vinyl ester resin were utilized, whose stacking sequences are 03s, 0/903s, CSM/0/902s, ±453s and (0/90)2/(±45)2/(0/90)2s, respectively. The test results indicate that the ±45° tensile shear test can predict shear moduli of composite material laminates accurately. However, the predictions of shear strength using ±45° tensile shear test are significantly lower than those of V-notched rail shear test. 相似文献
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本文以大型焊接回转筒体工作状态中的主要技术参数为依据,分析和判断大型焊接回转筒体环缝接头产生疲劳失效的部位和原因。通过计算分析,校核和建立故障树分析方法,求出大型焊接回转筒体的失效模式。从而,提出预防失效的主要途径,为大型异厚回转筒体的设计、制造、使用提供可借鉴的依据。 相似文献
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针对应用油墨印花新技术开发不锈钢壳身系列保温瓶新产品,研制了金属薄壁筒平网印花机。设备在结构上采用了双凸凸轮正弦加速度升降机构,启动平稳,运行稳定,生产效率高。设备的移位机构凸轮、曲柄整体连结,运动协调,结构紧凑,使用、维护方便,在机构的一个运动周期内可以精确的完成两次印花工艺。 相似文献
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A continuum damage mechanics （CDM） meso-model was derived for both intraply and interply progressive failure behaviors of a 2D woven-fabric composite laminate under a transversely low velocity impact.An in-plane anisotropic damage constitutive model of a 2D woven composite ply was derived based on CDM within a thermodynamic framework,an elastic constitutive model with damage for the fibre directions and an elastic-plastic constitutive model with damage for the shear direction.The progressive failure behavior of a 2D woven composite ply is determined by the damage internal variables in different directions with appropriate damage evolution equations.The interface between two adjacent 2D woven composite plies with different ply orientations was modeled by a traction-separation law based interface element.An isotropic damage constitutive law with CDM properties was used for the interface element,and a damage surface which combines stress and fracture mechanics failure criteria was employed to derive the damage initiation and evolution for the mixed-mode delamination of the interface elements.Numerical analysis and experiments were both carried out on a 2D woven glass fibre/epoxy laminate.The simulation results are in agreement with the experimental counterparts,verifying the progressive failure model of a woven composite laminate.The proposed model will enhance the understanding of dynamic deformation and progressive failure behavior of composite laminate structures in the low velocity impact process. 相似文献
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赵金霞 《河北能源职业技术学院学报》2005,5(3):62-62,65
BDF砼薄壁筒体构件是一种比较新型的芯管,它有效解决了现浇空心楼板非抽心成孔技术,被广泛的应用于工业与民用建筑大跨度、大空间、大荷载的现浇空心楼板中。本文从它的适用范围、结构特点及施工方法等几方面对该构件进行了阐述。 相似文献
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在机械行业中，许多产品都采用液压传动，而液压传动中，重要的执行部件就是液压油缸。液压油缸往往是采用钢筒进行滚压加工后制成。本文对液压油缸滚压加工的原理进行了分析；对精密钢筒滚压机理进行了研究；对精密钢筒滚压加工滚压力推导出计算公式。使滚压加工理论及滚压力的计算具有了可靠的依据。 相似文献
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李冬梅 《广东教育学院学报》2007,27(3):56-58
为了揭示多个表面割口单向纤维增强复合材料叠层板的拉伸破坏机理,预估其破坏规律,基于剪滞理论,建立一种对各单层分划为有限子单元的剪滞分析模型,分析含三个平行的表面割口单向叠层板在拉伸载荷作用下的应力重新分布及各割口之间的相互影响问题,获得了表面割口附近完整纤维的应力集中因子、应力及位移分布规律. 相似文献
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Extensive research has shown that externally bonded carbon fiber reinforced polymer (CFRP) laminates are particularly suitable for improving the fatigue behavior of reinforced concrete (RC) beams. This paper presents the research on flexural rigidity evolvement laws by testing 14 simple-supported RC beams strengthened with carbon fiber laminates (CFL) under cyclic load, and 2 under monotone load as a reference. The cyclic load tests revealed the peak load applied onto the surface of a supported RC beam strengthened with CFL is linear to the logarithm of its fatigue life, and the flexural rigidity evolvement undergoes three distinct phases: a rapid decrease from the start to about 5% of the fatigue life; an even development from 5% to about 99% of the fatigue life; and a succedent rapid decrease to failure. When the ratio of fatigue cycles to the fatigue life is within 0.05 to 0.99, the flexural rigidity varies linearly with the ratio. The peak load does not affect the flexural rigidity evolvement if it is not high enough to make the main reinforcements yield. The dependences of the flexural rigidity of specimens formed in the same group upon their fatigue cycles normalized by fatigue life are almost coincident. This implies the flexural rigidity may be a material parameter independent of the stress level. These relationships of flexural rigidity to fatigue cycles, and fatigue life may be able to provide some hints for fatigue design and fatigue life evaluation of RC member strengthened with CFL; nevertheless the findings still need verifying by more experiments. 相似文献
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