Wear of Tools Coated with Various PVD Films: Correlation with Impact Test Results by Means of FEM Simulations

2007 ◽  
Vol 4 (3) ◽  
pp. 301-310 ◽  
Author(s):  
Konstantinos-Dionysios Bouzakis ◽  
Ioannis Mirisidis ◽  
Nikolaos Michailidis ◽  
Eleftheria Lili ◽  
Anastasios Sampris ◽  
...  
Keyword(s):  
Impact Test ◽  
Test Results ◽  
Fem Simulations

Analysis Method for Impact and Dispersion Behavior of Water-Filled Tank

2018 ◽  
Vol 4 (4) ◽  
Author(s):  
Hidekazu Takazawa ◽  
Kazuma Hirosaka ◽  
Katsumasa Miyazaki ◽  
Norihide Tohyama ◽  
Naomi Matsumoto
Keyword(s):  
Structural Damage ◽  
Impact Test ◽  
Velocity Ratio ◽  
Research Centre ◽  
Dispersion Pattern ◽  
Test Results ◽  
Analysis Method ◽  
Cylindrical Tank ◽  
Dispersion Behavior ◽  
The Impact

A new Japanese nuclear regulation involves estimating the possible damage to plant structures due to intentional aircraft impact. The effect of aircraft impact needs to be considered in the existing nuclear power plants. The structural damage and fuel dispersion behavior after aircraft impact into plant structures can be evaluated using finite element analysis (FEA). FEA needs validated experimental data to determine the reliability of the results. In this study, an analysis method was validated using a simple model such as a cylindrical tank. Numerical simulations were conducted to evaluate the impact and dispersion behavior of a water-filled cylindrical tank. The simulated results were compared with the test results of the VTT Technical Research Centre of Finland (VTT). The simulations were carried out using a multipurpose FEA code LS-DYNA®. The cylindrical tank was modeled using a shell element, and the tank water was modeled using smoothed particle hydrodynamics (SPH) elements. First, two analysis models were used to evaluate the effect of the number of SPH elements. One had about 300,000 SPH elements and the other had 37,000 SPH elements. The cylindrical tank ruptured in the longitudinal direction after crashing into a rigid wall, and the filled water dispersed. There were few differences in the simulated results when using different numbers of SPH elements. The VTT impact test was simulated with an arbitrary Lagrangian-Eulerian (ALE) element to consider the air drag. The analytical dispersion pattern and history of dispersion velocity ratio agreed well with the impact test results.

scholarly journals Heat treatment effect on metal matrix composite with brass matrix and fly ash

2018 ◽  
Vol 204 ◽  
pp. 05020
Author(s):  
Aminnudin Aminnudin ◽  
Moch. Agus Choiron
Keyword(s):  
Heat Treatment ◽  
Fly Ash ◽  
Metal Matrix Composite ◽  
Matrix Composite ◽  
Coal Combustion ◽  
Metal Matrix ◽  
Treatment Process ◽  
Impact Test ◽  
Test Results ◽  
The Matrix

Metal matrix composite (MMC) is a combination of two or more materials using metal as a matrix. In this paper we used brass as the matrix and fly ash as for the particle. The fly ash used is fly ash which is produced from coal combustion in the Paiton power plant. Fly ash composition in the MMC are 5% and 10%. The MMC was produced with gas furnace. Heat tratment to MMC was done at 350 and 400 °C.Hard testing process, tensile test and impack test are carried out at MMC before heat treatment and after heat treatment. From the test results showed an increase in hardness, tensile strength and impact test showed the heat treatment process at a temperature of 350 °C. Heat treatment at a temperature of 400 °C does not improve the mechanical properties of MMC

PREDICTION OF A MODIFIED PTW MODEL FOR VARIOUS TAYLOR IMPACT TESTS OF TANTALUM

2008 ◽  
Vol 22 (31n32) ◽  
pp. 6247-6252 ◽  
Author(s):  
JONG-BONG KIM ◽  
HYUNHO SHIN
Keyword(s):  
Strain Rate ◽  
Strain Hardening ◽  
Impact Test ◽  
Constitutive Behavior ◽  
Test Results ◽  
Impact Tests ◽  
Different Temperatures ◽  
Taylor Impact ◽  
Prediction Capability ◽  
Voce Equation

The strain hardening part of the Preston-Tonks-Wallace (PTW) model, developed for the description of the plastic constitutive behavior of materials at wide ranges of strain, strain rate, and temperature, has been modified by employing the Voce equation. The prediction capability of the modified PTW (MPTW) has been investigated with reference to Taylor impact test results in the literature, and comparison has been made with the models of Johnson-Cook (JC), Steiberg-Guinan (SG), Zerilli-Armstrong (ZA), and PTW. Of the compared existing models, no model was appropriate for describing the results of various Taylor impact tests. However, the modified PTW is shown to predict fairly accurate results in terms of the length, diameter, and shape of the deformed specimen tested at different temperatures and impact velocity.

S191024 Re-entry Capsule Water Impact Test Results : Vertical Free Fall Water Impact Test

2012 ◽  
Vol 2012 (0) ◽  
pp. _S191024-1-_S191024-4
Author(s):  
Eiichiro NAKANO ◽  
Hideaki UCHIKAWA ◽  
Hideyuki TANNO ◽  
Takashi SEKI
Keyword(s):  
Impact Test ◽  
Free Fall ◽  
Test Results ◽  
Water Impact

Micro-Deval Testing of Aggregates in the Southeast

2003 ◽  
Vol 1837 (1) ◽  
pp. 73-79 ◽  
Author(s):  
L. Allen Cooley ◽  
Robert S. James
Keyword(s):  
Los Angeles ◽  
Magnesium Sulfate ◽  
Impact Test ◽  
Southeastern United States ◽  
Test Results ◽  
Performance Category ◽  
Los Angeles Abrasion ◽  
National Cooperative ◽  
Highway Research

Aggregate used in hot-mix asphalt (HMA) must be tough and durable, not only to withstand the effects of HMA production, transportation, and construction but also to resist the effects of traffic and the environment. Historically, the Los Angeles abrasion and impact test has determined the toughness of aggregates. The long-term durability characteristics of aggregates are generally determined using a soundness test: sodium or magnesium sulfate. During the National Cooperative Highway Research Program’s Project 4–19, the micro-Deval test, in conjunction with the magnesium sulfate soundness test, were recommended in lieu of the Los Angeles abrasion and impact test and other soundness tests. Therefore, a study was needed within the southeastern United States to evaluate the range in micro-Deval results that could be expected. This research characterized the toughness and durability of aggregates with respect to their micro-Deval test results. Seventy-two aggregate sources from eight different states were included in this research. These aggregates were rated as good, fair, or poor with respect to performance by the contributing state. On the basis of the results of this study, some large differences were found in micro-Deval test results within a given performance category. There was no relationship between Los Angeles abrasion and impact and micro-Deval test results.

scholarly journals Investigation and comparison between new satellite impact test results and NASA standard breakup model

2008 ◽  
Vol 35 (12) ◽  
pp. 1567-1572 ◽  
Author(s):  
K. Sakuraba ◽  
Y. Tsuruda ◽  
T. Hanada ◽  
J.-C. Liou ◽  
Y. Akahoshi
Keyword(s):  
Impact Test ◽  
Test Results ◽  
Breakup Model

Manufacturing and Mechanical Property Evaluations of PLA/Carbon Fiber/Glass Fiber Composites

2015 ◽  
Vol 749 ◽  
pp. 261-264 ◽  
Author(s):  
Jia Horng Lin ◽  
Chien Lin Huang ◽  
Chih Kuang Chen ◽  
Jo Mei Liao ◽  
Ching Wen Lou
Keyword(s):  
Carbon Fiber ◽  
Glass Fiber ◽  
Impact Test ◽  
Fiber Composites ◽  
Production Costs ◽  
Test Results ◽  
Flexural Test ◽  
Fiber Glass ◽  
Glass Fiber Composites ◽  
Scanning Electron

This study uses carbon fiber (CF) and glass fiber (GF) as reinforcement for polylactic acid (PLA) fiber, and their mixtures are melt-blended into PLA/CF/GF composites. Mechanical properties of the composites are evaluated by applying a tensile test, a flexural test, and an impact test, and the dispersion of fibers is observed by using a scanning electron microscopy (SEM). The test results show that the increasing content of CF results in a greater strength in the composites while the increasing content of GF provides the composites with greater modulus. The combination of both CF and GF contributes to a certain level of mechanical strength and also decreases the production costs for the composites.

On the System Dependency of Satellite Sounding Impact-Comments on Recent Impact Test Results

1981 ◽  
Vol 109 (1) ◽  
pp. 197-200 ◽  
Author(s):  
M. S. Tracton ◽  
A. J. Desmaris ◽  
R. J. van Haaren ◽  
R. D. McPherson
Keyword(s):  
Impact Test ◽  
Test Results

scholarly journals CAE Modeling Rubber-metal Body Mounting of the Body-on-frame Car in Crash Simulations

2020 ◽  
Vol 14 ◽  
Keyword(s):  
Impact Test ◽  
Point Of View ◽  
The Body ◽  
Crash Test ◽  
Test Results ◽  
Rigid Connection ◽  
Metal Body ◽  
Stiffness Characteristics ◽  
The Impact ◽  
Crash Tests

The aim of the study was to research the behavior of the rubber-metal body mounting under various modeling options and to select the optimal, from the point of view of ensuring the accuracy of the results in the crash tests simulations. Body supports provide a link between the body and the car frame, and this has a critical effect on the impact test results of the car. The article discusses various options for modeling the body mounting by the degree of simplification from the simplest model with a rigid connection between the body and the frame to the model that takes into account the non-linearity of the stiffness characteristics of the supports, contact interaction between parts of the mounting and its surrounding parts, tension of the supports and failure. The results of virtual tests of a car with various options for modeling mountings were compared with the results of real tests. As a result of the study, a methodology for modeling the body supports was developed, which allows providing the necessary measurement error in virtual crash test modeling.

scholarly journals Optimisation of ballistic protection systems based on impact test/simulation correlation

2021 ◽  
Vol 250 ◽  
pp. 04001
Author(s):  
Yohan Cosquer ◽  
Patrice Longère ◽  
Olivier Pantalé ◽  
Claude Gailhac
Keyword(s):  
Numerical Model ◽  
Total Mass ◽  
Impact Test ◽  
Single Layer ◽  
Test Results ◽  
Protective Capacity ◽  
Layer System ◽  
Residual Velocity ◽  
Ballistic Protection ◽  
Protection Systems

The complexity of ballistic protections increases with their efficiency. On this basis, an exclusively empirical approach is not adapted to optimise complex protection systems and the resort to numerical simulations is preferred if not mandatory. The present study proposes a methodology aiming at optimising complex multi-layer ballistic armours based on an experimental-numerical correlation. A multi-layer system is taken as example. A numerical model is first calibrated according to impact-on-monolithic-target test results. Once the model is validated, an optimisation process considering multi-layer configurations involving a sharp-nosed threat modifies the plates’ thicknesses in order to minimise the total mass while ensuring the system’s protective capacity in terms of residual velocity. The optimisation process shows that a single layer system is more efficient than a multi-layer one in the studied case.

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