Influence of interface structure and stress distribution on fracture and mechanical performance of STS439/Al1050/STS304 clad composite

2019 ◽  
Vol 749 ◽  
pp. 35-47 ◽  
Author(s):  
Yong Keun Kim ◽  
Sun Ig Hong
Keyword(s):  
Stress Distribution ◽  
Mechanical Performance ◽  
Interface Structure

Electromagnetic Wave Absorbing and Mechanical Properties of Cement-Based Composite Panel with Different Nanomaterials

2017 ◽  
Vol 26 (1) ◽  
pp. 096369351702600
Author(s):  
Sun Yafei ◽  
Gao Peiwei ◽  
Peng Hailong ◽  
Liu Hongwei ◽  
Lu Xiaolin ◽  
...  
Keyword(s):  
Compressive Strength ◽  
Electromagnetic Wave ◽  
Double Layer ◽  
Mechanical Performance ◽  
Interface Structure ◽  
Composite Panel ◽  
Effective Bandwidth ◽  
Composite Panels ◽  
Frequency Range ◽  
Triple Layer

This paper presents the microstructures and mechanical and absorbing properties of double and triple layer, cement-based, composite panels. The results obtained show that the frequency range in 2-18GHz had less than −10dB effective bandwidth, which correlates with 3.7and 10.8GHz in double and triple layer cement-based composite panels. Furthermore, the double layer panel's compressive strength at 7 and 28 days was 40.2 and 61.2MPa, respectively. For the triple layer panel, the strength values were 35.6MPa and 49.2MPa. The triple layer panel's electromagnetic wave (EMW) absorbing properties were superior compared to the properties of the double layer panel. However, the triple layer panel's mechanical performance was inferior to that of the double layer panel. This study proposes that carbon nanotubes can effectively improve the compressive strength and interface structure of cement-based composite panels.

Effect of the frictional coefficient and pre-tension on stress distribution of fabric during the weaving process

2017 ◽  
Vol 88 (8) ◽  
pp. 904-912
Author(s):  
Zhiping Ying ◽  
Zhenyu Wu ◽  
Xudong Hu ◽  
Xiangqing Zhou
Keyword(s):  
Numerical Model ◽  
Stress Distribution ◽  
Mechanical Performance ◽  
Frictional Coefficient ◽  
Woven Fabric ◽  
Weft Yarn ◽  
Tension Stress ◽  
Initial Shape ◽  
Warp Tension ◽  
Fluctuation Range

The non-uniform stress distribution of woven fabric has a significant influence not only on its mechanical performance in service, but also on its weaving efficiency in the fabrication process. For investigating the stress distribution in woven fabric, a numerical model at the yarn scale was established to simulate the interlacing process between the weft and warp yarns using an explicit finite element solver. The yarns were assumed to be a homogeneous continuum and the transversal isotropic constitutive equation was used. A modified lenticular initial shape was used as the cross-section of the yarn and trajectories of warp and weft yarns were set to be straight. The classical Amonton–Coulomb law was used for the tangential behavior between the weft and warp yarns. The simulation results reveal that the interaction between weft and warp yarns consists of three phases in terms of contact, adhesion and sliding. The sectional stress distribution in the weft yarn determined by multi-points contact between a single weft yarn and a group of warp yarns was also analyzed. The tension stress of the weft yarn was larger in the middle part than that in both sides. Based on the numerical model, the effects of two key parameters, namely the frictional coefficient and weft pre-tension, on the stress distribution were discussed in detail. The weft crimp angle and warp tension distribution uniformity decreased as the frictional coefficient decreased, whereas the warp tension fluctuation range did not obviously decrease. However, an improved method by exerting pre-tension in two ends of weft yarn was proposed and the warp tension fluctuation range was significantly decreased. The distribution trend of warp tension obtained from the numerical simulation showed an acceptable tendency with experiment measurements.

Stress Analysis under Cu Bump Bonding Process

2012 ◽  
Vol 217-219 ◽  
pp. 2317-2321 ◽  
Author(s):  
Chun Yue Huang ◽  
Ying Liang ◽  
Song Wu ◽  
Tian Ming Li
Keyword(s):  
Stress Distribution ◽  
Flip Chip ◽  
Mechanical Performance ◽  
Copper Wire ◽  
Low Cost ◽  
Element Model ◽  
Bonding Process ◽  
Bonding Pressure ◽  
Shaping Process ◽  
Set Up

The copper wire has some advantages in thermal performance, mechanical performance, and low cost, which make it can provide the lowest cost flip-chip(FC) package for low I/O density device. The 2D Cu stud bump finite element model was set up by using ANSYS/LS-DYNA with LOLID162 element to dynamic simulate the Cu stud bump bonding shaping process. The stress distribution in the Cu stud bump and the pad during the bonding process were studied, and the influence of pad thickness on the stress distribution of Si chip was also analyzed. The results shows that under the bonding process the Cu bump height is mainly influenced by the bonding pressure and the top shape of the Cu bump is influenced by ultrasonic energy, the increase of pad thickness results in reducing stress concentration inside the Si chip.

Lightweight Design of a Multi-Material Suspension Lower Control Arm

2020 ◽  
Author(s):  
Alessandro Messana ◽  
Lorenzo Sisca ◽  
Alessandro Ferraris ◽  
Andrea Giancarlo Airale ◽  
Massimiliana Carello
Keyword(s):  
Carbon Fiber ◽  
Stress Distribution ◽  
Carbon Fibre ◽  
Mechanical Performance ◽  
Lightweight Design ◽  
Design Analysis ◽  
Hybrid Technology ◽  
Mechanical Coupling ◽  
Lower Control Arm

Abstract This paper is focused on the design, analysis and testing of a multi-material (carbon fibre and steel) Lower Control Arm (LCA) of a McPherson suspension for a C segment vehicle. Therefore, starting from the existing component (made of steel), the LCA mass has been reduced by using a hybrid technology, diminishing the steel thickness and adding a carbon fiber tailored cover without compromising the mechanical performance in terms of stiffness and stress distribution. In so doing, it has been possible to evaluate the potential and the capabilities of the hybridization without re-designing the component totally. In particular, it has been developed a specific methodology that combines both virtual and experimental procedures to face the hybridization challenges of mechanical coupling, safety and lightweight. For these reasons, the multi-material lower control arm represents a noticeable case study in which this methodology has been applied, correlated and validated.

Dynamic Analysis of Three Types of Bioprosthetic Heart Valves

2011 ◽  
Vol 71-78 ◽  
pp. 2683-2688
Author(s):  
Xin Ye ◽  
Quan Yuan ◽  
Hua Cong ◽  
Hai Bo Ma ◽  
Dong Liang Wei
Keyword(s):  
Stress Distribution ◽  
Heart Valve ◽  
Computer Aided Design ◽  
Heart Valves ◽  
Mechanical Performance ◽  
Bioprosthetic Valve ◽  
Von Mises Stress ◽  
Element Analysis ◽  
Diastolic Phase ◽  
Von Mises

This paper constructs three types of bioprosthetic valve leaflets’ parametric model via computer aided design, a series of accurate parameters of the bioproshtetic heart valve, such as radius of the sutural ring, height of the supporting stent and inclination of the supporting stent, are determined. Numerical simulation is used to determine the effect of different shape designs on the mechanical performance of the bioprosthetic valve leaflet. The dynamic behavior of the valve during diastolic phase is analyzed. The finite element analysis results show the stress distribution of the ellipsoidal and spherical valve leaflets are comparatively reasonable. The ellipsoidal and spherical valve leaflets have the following advantages over the cylindrical leaflet valve, lower peak von-Mises stress, smaller stress concentration area, and relatively uniform stress distribution. The ellipsoidal and spherical valve leaflets may contribute to the long term durability of the valve. This work is very helpful to manufacture valvular leaflets with reasonable shapes and to prolong the lifetime of the bioprosthetic heart valve.

Research on Structure Stress Analysis on Composite by Lock-In Thermography

2010 ◽  
Vol 150-151 ◽  
pp. 1649-1654
Author(s):  
Xun Liu ◽  
Jun Yan Liu ◽  
Jing Min Dai
Keyword(s):  
Composite Materials ◽  
Stress Concentration ◽  
Stress Distribution ◽  
Stress Analysis ◽  
Principal Stress ◽  
Mechanical Performance ◽  
Material Structure ◽  
Thermoelastic Effect ◽  
Component Structure ◽  
Lock In

The application of thermoelastic stress analysis in composite materials is particularly complicated because of the anisotropy of the material, which determines the thermoelastic effect to be depended on the material property and mechanical performance. This paper describes a theoretical and experimental analysis on full-filed stress distribution from thermoelastic measurements and its application to determination of stress concentration. The sum of the principal stress can be measured by Thermal Stress Analysis (TSA). Lock-in Thermography has been applied to measure the sum of principal stress distribution of component structure by its high thermal resolving. In this study, Experiments were carried out with GFRP composite ply and foam materials under cyclic load. The thermoelastic constant is obtained for GFRP and foam composite materials. The stress concentration is analyzed for a specimen with a hole. The experimental results show the stress distribution can be measured and analyzed using Lock-in thermography. It is found that the composite material structure stress can be evaluated with good accuracies by lock in thermography.

scholarly journals Pullout Test on Fully Grouted Bolt Sheathed by Different Length of Segmented Steel Tubes

2017 ◽  
Vol 2017 ◽  
pp. 1-16 ◽  
Author(s):  
Xiaowei Feng ◽  
Nong Zhang ◽  
Guichen Li ◽  
Gangye Guo
Keyword(s):  
Stress Distribution ◽  
High Performance ◽  
Mechanical Performance ◽  
Axial Stress ◽  
Testing Machine ◽  
Steel Tube ◽  
Steel Tubes ◽  
Specific Order ◽  
Axial Stress Distribution ◽  
Fully Grouted Bolt

In order to evaluate the anchorage performance of rebar bolt sheathed by different length of segmented steel tubes, a total of eight groups of pullout tests were conducted in this study. The steel tubes, segmented by 5 cm, 7 cm, 9 cm, 10 cm, and 15 cm, utilized in current study were bonded together by a high performance two-component adhesive to form standard 30 cm long steel tube. Unlike axial stress distribution in bolt, the axial stress distribution in steel tube showed exponential decrease trend from tube-clamp end to bolt-clamp end; thus a series of interesting results were observed. For instance, the sequence for segments detachment had its specific order of priority; the failure form of bolting system, the load oscillation characteristics, and the final displacement were highly determined by the length of the last segment, namely, the one fixed by clamp of testing machine. Moreover, the load-displacement relationship for some particular samples was further investigated from the perspective of energy transformation, and the disequilibrium extension of interfacial decoupling was also discussed. This paper, from a relatively idealized perspective, presents a laboratorial solution to interpret the mechanical performance of the bolt installed in layered strata; so far at least it demonstrates that a bolt installed in comparatively thicker layer of strata can last more durable and stable.

Analysis of Three-Axis Turntable for Motion Simulation Based on Virtual Prototyping

2010 ◽  
Vol 34-35 ◽  
pp. 1554-1558 ◽  
Author(s):  
Hong Li Chen ◽  
Xin Qiao ◽  
Xi Wei Yang ◽  
Chuan Yu Wu
Keyword(s):  
Stress Distribution ◽  
Mechanical Performance ◽  
Structural Characteristics ◽  
Virtual Prototyping ◽  
Basic Structure ◽  
Mechanical Analysis ◽  
Motion Simulation ◽  
Ground Vehicles ◽  
Fem Method ◽  
Simulation Based

A turntable is needed to simulate the motion of ground vehicles in laboratory. Such a turntable was presented in the paper. The basic structure of the turntable was that it could rotate around their own 3 axis, thus all forms of motion of ground vehicles could be simulated. The mechanical performance of the turntable was studied by virtual prototyping method using software CATIA, including structural characteristics, centroid, moment of inertia and turning space. Mechanical analysis was performed, the deformation and stress distribution of the turntable were analyzed. The modal analysis of the turntable was performed using FEM method. Those analysis results show the 3-axis turntable can simulate the motion of ground vehicles.

Structure, Chemical Stability and Properties of NiAl-Al2O3 Interface Modified by hBN and MAX-Phase Interlayers

2010 ◽  
Vol 638-642 ◽  
pp. 2001-2006 ◽  
Author(s):  
Jia Song ◽  
Wei Ping Hu ◽  
Yun Long Zhong ◽  
Hao Chen ◽  
Günter Gottstein
Keyword(s):  
Mechanical Properties ◽  
Shear Strength ◽  
Chemical Stability ◽  
Mechanical Performance ◽  
Interfacial Area ◽  
Interface Structure ◽  
Max Phase ◽  
Structure Property ◽  
Interface Shear Strength ◽  
Interface Shear

The interlayers from different materials were used in order to modify the interface structure/property and to improve the mechanical properties of NiAl composites reinforced by continuous single crystal Al2O3 fibers. It was found that the interface without interlayer had a good chemical stability during hot pressing (sample fabricating), resulting in high interface shear strength (about 250 MPa) at RT. But for the composites with interlayers, chemical reactions occurred in the interfacial area during diffusion bonding. The measured interface shear strength for the complete debonding was 70±30 MPa, 110±36 MPa and 32±5 MPa for the composites with hBN, Cr2AlC and V2AlC interlayers respectively. The possible influences by introducing the interlayers on mechanical performance of NiAl composites are discussed.

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