Papers by Keyword: Bonding Strength

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Authors: Jun Zhang, Zhong Yao Zhao, Xin Li Wei
Abstract: A modified cohesive zone interface model that has a damage factor couple with the thermal cycle and humidity aging was proposed. The damage factor not only can change the cohesive zone strength acting but also can effect on the energies of separation. The modified cohesive zone interfacial model is developed and implemented in ABAQUS, as a user element subroutine, to simulate the peeling process for the specimen bonding by anisotropic conducive adhesive film (ACF) under the thermal cycle and humidity tests. Finite element explicit code and the constitutive relation of this element has been defined by the user-defined mechanical material behaviour (VUMAT). The bulk material element selected is a 4-node bilinear plane stress quadrilateral element, and the reduced integration and hourglass control are also adopted. The numerical simulated results accorded well to the experiments to illustrate the validity of the new model.
374
Authors: James C. Sung, Shao Chung Hu, Yen Shuo Chang
Abstract: The thick braze alloy coating can hold diamond much firmer than thin element coatings (Ti, Cr, Si) of commercial saw diamond grits. Moreover, the braze alloy can form metallurgical bonding readily with the metal matrix of saw segments. As a result, diamond saws that employ ABCD can cut much faster and last much longer than conventional designs. ABCD can be planted in metal matrix to form three dimensional pattern, the chemical bonding of diamond and its controlled spacing can virtually eliminate diamond loss due to pullouts and diamond breakage due to excessive impact force. The greatly increased number of working crystals can extend the segment life by one order of magnitude. With the thick coating, ABCD can join together to form needles or plates that could not be possible with thinly coated diamond. The ABCD needles or plates can be planted or arranged in a metal matrix to form a three-dimensional structure. Such unique designs can greatly expand the functions of diamond saws.
725
Authors: Nur Hasmiza Abdul Hamid, Mansur Ahmad, Mohd Nazip Suratman, Muhamad Nizam Azhar, Nor Athirah Mohamad Rosli
Abstract: Majority of engineered wood product such as glulam, laminated veneer lumber and parallel strand lumber relies greatly on wood adhesive bonding and adhesive penetration. Determination of bonding strength and adhesive penetration of adhesive-wood could enhance effective utilization of wood as construction material. Kapur (Dryobalanops aromatica) and Kelat (Syzygium spp.) were two commercial Malaysian medium hardwoods were used in the study. Since pressure is essential during wood bonding, the purpose of the study is to determine the effect of different pressure on bonding strength and adhesive penetration. Kapur and Kelat samples were bonded using Phenol resorcinol formaldehyde (PRF) and press at three different pressures (100 psi, 200 psi and 300 psi). Shear stress of bond line and Adhesive penetration were measured. The result shows that Kapur has lower bonding strength compares to Kelat and both samples pressed with 200 psi pressure shows higher shear strength then 100 psi and 300 psi. The result of adhesive penetration shows that higher pressure applied during bonding assembly resulting in the higher adhesive penetration into the wood porous structure.
170
Authors: Takahiro Namazu, Shozo Inoue
Abstract: This paper describes evaluation of the strength in Ag-Sn-jointed Si specimens heated by Al/Ni film’s exothermic reaction. The reaction generates heat enough to melt Ag-Sn film for soldering. To measure the strength, four-point micro-bending test technique has been developed. The rectangular-solid Si specimens having a Ag-Sn/AlNi/Ag-Sn section were prepared by dicing the bonded Si-wafer under various pressure loads. A higher pressure yielded a better contact condition between Al/Ni and Ag-Sn so that heat-conduction improved; consequently Ag-Sn was melted sufficiently. Al/Ni reactive film has a potential as a micro-heater in soldering for MEMS.
2142
Authors: Qiu Lian Dai, Fang Yi You, Can Bin Luo
Abstract: The possibility of using the new processing technique of vacuum evaporative pattern casting (V-EPC) process to fabricate the Al-Si based bonded diamond grinding wheels was explored in this paper. Distribution of diamond grits in the diamond/EPS composite pattern and in the grinding layer of the cast of the grinding wheel were analyzed. Microstructures and mechanical properties of the metal bonds and diamond composites fabricated by V-EPC process were studied. It is confirmed that thermal damage of the diamond grits did not occur. Strong bonding between metal bond and diamond grits can be produced. However, the uniformity of the distribution of diamond grits in the metal matrix should be further improved. Also, further hardening on the metal bond is necessity by trying other kinds of aluminum alloys.
249
Authors: Guo Hui Chen, Jun Tian, Chen Liu, Dong Li, Xiang Hui Lu
Abstract: The properties of interface and bonding between the liner and propellant were systematically studied with regard to MAPO content, filler and plasticizer types, and vulcanized agent. It was indicated that the bonding strength of liner and propellant arrive the highest value 0.32MPa when MAPO contents was 3% and there is a little effect on bonding strength for vulcanized parameter. Moreover, the bonding strength gets weaker when the content of plasticizer decreases. Significantly, the molecular sieve can improve bonding strength greatly. Compared with other cure agent, TDI was the best vulcanized agent, and when it was used in the vulcanized system, the highest value of bonding strength between liner and propellant could be obtained.
44
Authors: Hong Bin Wang, Cheng Jian Jiang, Delehei, Xue Da Feng
Abstract: By Using polymer modified asphalt bridge deck waterproof coating synchronous shearing spraying technology, the fiber reinforced bridge deck waterproofing adhesive layer had succeed carried out in Xisang highway bridge. Shear test was conducted in the waterproof layer structure. When completed bridge deck pavement, core was drilled and samples were carried out pull-out test. The results indicate that fiber reinforced bridge deck waterproof layer can improve waterproof coating gave resistance, crack resistance and tensile ability. The introduction of asphalt bridge deck waterproof can improve the bonding strength between the layers and the overall shear strength of the waterproof layer, enhance the overall waterproof effect and enhance the service life of asphalt layer effectively.
273
Authors: Mitsuo Niinomi, Masaaki Nakai, Junko Hieda, Ken Cho, Takashi Goto, Takao Hanawa
Abstract: Recently, low-modulus β-type titanium alloys have been the focus of considerable attention because of their high biocompatibility and their low moduli that make them effective for inhibiting bone atrophy and for enhancing bone remodeling. However, the biofunctinalities of titanium alloys, such as bone conductivity, blood compatibility, and soft tissue compatibility, are poor. Therefore, surface modification techniques such as bioactive ceramic surface modification and blood-and soft-tissue-compatible polymer surface modification are applied to titanium alloys. Hydroxyapatite (HAp) surface modification via metal organic chemical vapor deposition (MOCVD) and segmented polyurethane (SPU) surface modification via silane coupling treatment are effective techniques to add biofunctionalites to titanium alloys. HAp surface modification via MOCVD and SPU surface modification using three kinds of silane coupling agents on a low modulus beta-type titanium alloy, namely, TNTZ, are discussed. Moreover, the bonding strengths of HAp and SPU on the surface of TNTZ, which are important parameters, are also discussed.
78
Authors: Feng Xie, Xiao Bao Lei, Xiu Ying Wang
Abstract: This paper takes healthy teeth as research objects, and carries on data fitting to the enamel-dentinal joint surface based on least squares method and optimizes it. According to the result of data fitting, a series of joint surface shapes are designed and mathematical models of bionic design surfaces are given out. ABAQUS software is used to simulate and analyze the bonding strength of coating and substrate for different joint surfaces based on the transverse substrate stretched test, and the best shape parameters are obtained under a certain coating thickness. At last, the above data with the results of different plane joint surface are compared. The results show that the new bionic designed joint surface based on the enamel-dentinal joint surface of teeth can optimize coating stress distribution and improve coating tool’s bonding strength.
450
Authors: Xin Hong Wang, Zeng Da Zou, Min Zhang, Si Li Song, Shi Yao Qu
Abstract: WC-TiC-Co cermet and CuZnNi alloy composite coatings were produced on mild steel by a high temperature inside-furnace brazing technique. The microstructure, phase constituents and interfacial diffusion behavior of cermet and Cu-based alloy were investigated by means of scanning electron microscopy (SEM), transmission electron microscopy (TEM), electron probe microanalysis (EPMA) and X-ray diffraction. The tensile strength and wear property of composite coatings were also investigated. The results show that crème particles were not decomposed severely during the inside- furnace brazing process. The microstructure of the matrix is α and β phases. Diffusion occurred at the cermet/Cu-based alloy interface. The tensile strength of the composite coatings reached 240-300MPa, which depended on the brazing temperature and was far higher than that of the flame hardfacing layers. Cermet fracture was basically a brittle fracture in nature and matrix involves ductile fracture.
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