The Experts below are selected from a list of 10083 Experts worldwide ranked by ideXlab platform
Magnus Burman - One of the best experts on this subject based on the ideXlab platform.
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Tension, compression and shear fatigue of a Closed Cell foam
2020Co-Authors: Dan Zenkert, Magnus BurmanAbstract:A Closed Cell foam of Polymetacrylimide (RohaCell) with three different densities is studied. The foam is tested quasistatically in tension, compression and shear. The tensile properties scale very ...
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Fatigue of Closed-Cell foams in compression:
Journal of Sandwich Structures and Materials, 2010Co-Authors: Dan Zenkert, Magnus BurmanAbstract:This article deals with fatigue of Closed-Cell foams under compression loading. Testing is performed on three densities of DivinyCell H-grade and three densities of RohaCell WF-grade foam under cyc ...
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tension compression and shear fatigue of a Closed Cell polymer foam
Composites Science and Technology, 2009Co-Authors: Dan Zenkert, Magnus BurmanAbstract:A Closed Cell foam of Polymetacrylimide (RohaCell) with three different densities is studied. The foam is tested quasistatically in tension, compression and shear. The tensile properties scale very ...
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fatigue of Closed Cell foams
7th International Conference on Sandwich Structures Location: Aalborg Univ Aalborg Denmark Date: AUG 29-31 2005, 2005Co-Authors: Dan Zenkert, Andrey Shipsha, Magnus BurmanAbstract:This paper deals with fatigue of Closed Cell foams. The main idea is to use a few simple tests to predict the tension-tension fatigue properties of foams. The required testing consists of crack propagation rate measurements and one tension-tension fatigue test performed at yield stress for the foam. This data can then be combined to construct a synthetic S-N Curve for the foam. Tests on three densities of DivinyCell H-grade foam are performed and the results Support this approach. Some preliminary results from two densities of RollaCell WF-grade are given as well. Static properties of foams scale with relative density and once this scaling can be obtained through various static tests and the same scaling appears to be valid for both crack propagation rates and fatigue properties of foams. The implication of this is that once the fatigue behaviour of one relative density foam is established, one can predict the fatigue behaviour of all other relative density foams within the same class of materials.
Franck Bassinet - One of the best experts on this subject based on the ideXlab platform.
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influence of Cell wall thickness variations on elastic stiffness of Closed Cell Cellular solids
International Journal of Mechanical Sciences, 2000Co-Authors: Joachim L Grenestedt, Franck BassinetAbstract:Abstract The stiffness of Closed-Cell low-density Cellular solids, or solid foams, is affected by “imperfections” such as non-uniform Cell shape and size, wavy distortions of Cell walls, variations in Cell wall thickness, etc. The present paper focuses on the influence of non-uniform Cell wall thickness on stiffness. Calculations are performed on one model with different degrees of thickness variations. The model used is the flat-faced Kelvin structure, which consists of 14-sided polyhedra in a bcc arrangement. The results indicate that the stiffness of Closed-Cell Cellular solids is not very sensitive to thickness variations.
Dan Zenkert - One of the best experts on this subject based on the ideXlab platform.
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Tension, compression and shear fatigue of a Closed Cell foam
2020Co-Authors: Dan Zenkert, Magnus BurmanAbstract:A Closed Cell foam of Polymetacrylimide (RohaCell) with three different densities is studied. The foam is tested quasistatically in tension, compression and shear. The tensile properties scale very ...
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Fatigue of Closed-Cell foams in compression:
Journal of Sandwich Structures and Materials, 2010Co-Authors: Dan Zenkert, Magnus BurmanAbstract:This article deals with fatigue of Closed-Cell foams under compression loading. Testing is performed on three densities of DivinyCell H-grade and three densities of RohaCell WF-grade foam under cyc ...
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tension compression and shear fatigue of a Closed Cell polymer foam
Composites Science and Technology, 2009Co-Authors: Dan Zenkert, Magnus BurmanAbstract:A Closed Cell foam of Polymetacrylimide (RohaCell) with three different densities is studied. The foam is tested quasistatically in tension, compression and shear. The tensile properties scale very ...
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fatigue of Closed Cell foams
7th International Conference on Sandwich Structures Location: Aalborg Univ Aalborg Denmark Date: AUG 29-31 2005, 2005Co-Authors: Dan Zenkert, Andrey Shipsha, Magnus BurmanAbstract:This paper deals with fatigue of Closed Cell foams. The main idea is to use a few simple tests to predict the tension-tension fatigue properties of foams. The required testing consists of crack propagation rate measurements and one tension-tension fatigue test performed at yield stress for the foam. This data can then be combined to construct a synthetic S-N Curve for the foam. Tests on three densities of DivinyCell H-grade foam are performed and the results Support this approach. Some preliminary results from two densities of RollaCell WF-grade are given as well. Static properties of foams scale with relative density and once this scaling can be obtained through various static tests and the same scaling appears to be valid for both crack propagation rates and fatigue properties of foams. The implication of this is that once the fatigue behaviour of one relative density foam is established, one can predict the fatigue behaviour of all other relative density foams within the same class of materials.
Joachim L Grenestedt - One of the best experts on this subject based on the ideXlab platform.
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influence of Cell wall thickness variations on elastic stiffness of Closed Cell Cellular solids
International Journal of Mechanical Sciences, 2000Co-Authors: Joachim L Grenestedt, Franck BassinetAbstract:Abstract The stiffness of Closed-Cell low-density Cellular solids, or solid foams, is affected by “imperfections” such as non-uniform Cell shape and size, wavy distortions of Cell walls, variations in Cell wall thickness, etc. The present paper focuses on the influence of non-uniform Cell wall thickness on stiffness. Calculations are performed on one model with different degrees of thickness variations. The model used is the flat-faced Kelvin structure, which consists of 14-sided polyhedra in a bcc arrangement. The results indicate that the stiffness of Closed-Cell Cellular solids is not very sensitive to thickness variations.
Hua Zhong-sheng - One of the best experts on this subject based on the ideXlab platform.
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Sound absorption of perforated Closed-Cell aluminum foam
The Chinese Journal of Nonferrous Metals, 2020Co-Authors: Hua Zhong-shengAbstract:The Closed-Cell aluminum foam panels have certain sound absorption properties,which are significantly increased by perforating the aluminum foam panels. The sound absorption properties were studied from the perforation rate,cavity thickness with standing waves tube. The results show that the sound absorption coefficient of Closed-Cell aluminum foam increases by 30% after being perforated. However,when the perforation rate exceeds a certain value,the sound absorption coefficient decreases. Moreover,the highest sound absorption coefficient shows the trend of traveling to low-frequency region with increasing the cavity thickness.
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Design of Closed-Cell Aluminum Foam Sound Barriers
Noise and Vibration Control, 2020Co-Authors: Hua Zhong-shengAbstract:To reduce noise pollution of expressway and design better-performance sound barriers,an acoustic resonance type sound barrier is designed using Closed-Cell aluminum foam.The noise spectrum analyzer is used to measure the noise pollution.The sound absorption coefficient is measured using stationary-wave method.The Closed-Cell aluminum foam panel with 0.3g/cm3 mass density,10mm thickness and 3% perforation rate are used for the noise barrier.A 30mm thick cavity is designed on its back.The results of measurement show that the main sound absorption frequency range is from 300 to 400Hz,the sound absorption coefficient can reach 60%-90% for the noise frequencies lower than 500Hz.
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Sound Absorbility of Closed-Cell Aluminum Foam
Journal of Northeastern University, 2020Co-Authors: Hua Zhong-shengAbstract:The sound absorbility of Closed-Cell aluminum foam was further investigated in view of some factors,including density,thickness,back cavity depth and perforation rate.Instead of the only characteristic factor,i.e.,the peak value of sound absorption coefficient,the sound absorbility of Closed-Cell aluminum foam was therefore evaluated through three indices,i.e.,the peak value above mentioned,denoising coefficient and half peak width.With the sound absorption coefficient measured by standing-wave meter and the sound absorption curves analyzed by the software Origin,the corresponding functional relation was established.The results showed that in previous tests some specimens showed unfavorable effect of sound absorption as a whole though their peak values of sound absorption coefficient were high,while the other samples showed high sound absorption effect as a whole though their peak values were medium.So,the new method proposed to evaluate the sound absorbility is more actual and suitable for the design of sound absorption system.
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Effect of combining form on sound absorption of Closed-Cell aluminum foam perforated
The Chinese Journal of Nonferrous Metals, 2020Co-Authors: Hua Zhong-shengAbstract:The Closed-Cell aluminum foams with various specimen thicknesses,perforation ways and perforation rates were grouped with glass wool.The sound absorption coefficient was measured by standing-wave method,and the effect of combining form on the sound adsorption of Closed-Cell aluminum foam perforated was studied.The results show that,being evaluated by the maximum of sound absorption coefficient,noise reduction coefficient and half-peak breadth,the specimens with the maximum of sound absorption coefficient at low frequency should be put before the specimens with the maximum of sound absorption coefficient at high frequency,which shows two peaks of sound adsorption,and greatly increases the noise reduction coefficient and half-peak breadth.The maximum of sound absorption coefficient increases slightly in a combination of Closed-Cell aluminum foam perforated and glass wool.However,the glass wool is apt to cause environmental pollution.Thus,the combination is unsuitable for sound absorption.