Pub Date : 2004-11-01DOI: 10.1177/0731684404041147
K. John, S. Naidu
The variation of tensile strength of unsaturated polyester based sisal–glass hybrid composites with fiber loading has been studied. The tensile strength of these hybrid composites has been found to be higher than that of the matrix. The effects of NaOH treatment and trimethoxy silane (coupling agent) treatment on the tensile properties of these sisal–glass hybrid composites have also been studied. Significant improvement in tensile strength of the sisal–glass hybrid composites has been observed by these treatments.
{"title":"Tensile Properties of Unsaturated Polyester-Based Sisal Fiber–Glass Fiber Hybrid Composites","authors":"K. John, S. Naidu","doi":"10.1177/0731684404041147","DOIUrl":"https://doi.org/10.1177/0731684404041147","url":null,"abstract":"The variation of tensile strength of unsaturated polyester based sisal–glass hybrid composites with fiber loading has been studied. The tensile strength of these hybrid composites has been found to be higher than that of the matrix. The effects of NaOH treatment and trimethoxy silane (coupling agent) treatment on the tensile properties of these sisal–glass hybrid composites have also been studied. Significant improvement in tensile strength of the sisal–glass hybrid composites has been observed by these treatments.","PeriodicalId":16971,"journal":{"name":"Journal of Reinforced Plastics & Composites","volume":"150 1","pages":"1815 - 1819"},"PeriodicalIF":0.0,"publicationDate":"2004-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77535097","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2004-11-01DOI: 10.1177/0731684404041709
S. Mahale, D. Rajamani, A. Revathi, M. Prakash, S. Srihari, R. Rao
The hygrothermal diffusion and degradation behavior of a high-temperature cured glass–epoxy (Epoxy Novolac – EPN) composite system was studied under two environmental conditions (i.e. 323 K and 343 K immersion in distilled water). Samples immersed at 343 K showed higher diffusivity (Dc) value and lower saturation time (tm) than those of 323 K immersion while the maximum moisture content (Mm) remained the same, good Fickian correlation were observed for the composite system. As regards the degradative effects, the glass transition temperature (Tg) of the composite decreased with increased moisture content showing a maximum drop of 30 C at full saturation, while the mechanical properties (ILSS and IPS) of saturated specimens degraded upto 26 and 33% respectively. Further these mechanical properties obtained at 70 C/85%RH test condition showed good correlations with those predicted by a theoretical equation (Chamis et al. An Intergrated Theory for Predicting the Hydrothermo Mechanical Response of Advanced Composite Structural Components, Lewis Research Center, Cleveland, Ohio, NASA Technical Memorandum 73812).
研究了高温固化玻璃-环氧树脂(Epoxy Novolac - EPN)复合体系在323 K和343 K蒸馏水浸泡条件下的湿热扩散和降解行为。在最大含水率(Mm)不变的情况下，343 K浸泡的样品比323 K浸泡的样品具有更高的扩散系数(Dc)和更短的饱和时间(tm)，复合体系具有良好的菲克相关关系。在降解效果方面，随着含水率的增加，复合材料的玻璃化转变温度(Tg)下降，在完全饱和时最大下降30℃，而饱和试样的力学性能(ILSS和IPS)分别下降了26%和33%。此外，在70℃/85%RH测试条件下获得的这些力学性能与理论方程(Chamis et al.)预测的力学性能具有良好的相关性。预测先进复合材料结构部件水热机械响应的综合理论，Lewis研究中心，克利夫兰，俄亥俄州，NASA技术备忘录73812)。
{"title":"Hot-Wet Property Characterisation of a High-Temperature Cured Glass–Epoxy Composite in Immersion Environment","authors":"S. Mahale, D. Rajamani, A. Revathi, M. Prakash, S. Srihari, R. Rao","doi":"10.1177/0731684404041709","DOIUrl":"https://doi.org/10.1177/0731684404041709","url":null,"abstract":"The hygrothermal diffusion and degradation behavior of a high-temperature cured glass–epoxy (Epoxy Novolac – EPN) composite system was studied under two environmental conditions (i.e. 323 K and 343 K immersion in distilled water). Samples immersed at 343 K showed higher diffusivity (Dc) value and lower saturation time (tm) than those of 323 K immersion while the maximum moisture content (Mm) remained the same, good Fickian correlation were observed for the composite system. As regards the degradative effects, the glass transition temperature (Tg) of the composite decreased with increased moisture content showing a maximum drop of 30 C at full saturation, while the mechanical properties (ILSS and IPS) of saturated specimens degraded upto 26 and 33% respectively. Further these mechanical properties obtained at 70 C/85%RH test condition showed good correlations with those predicted by a theoretical equation (Chamis et al. An Intergrated Theory for Predicting the Hydrothermo Mechanical Response of Advanced Composite Structural Components, Lewis Research Center, Cleveland, Ohio, NASA Technical Memorandum 73812).","PeriodicalId":16971,"journal":{"name":"Journal of Reinforced Plastics & Composites","volume":"11 1","pages":"1883 - 1892"},"PeriodicalIF":0.0,"publicationDate":"2004-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72736263","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2004-11-01DOI: 10.1177/0731684404041141
S. C. Sharma, H. N. Narasimha Murthy, M. Krishna
Low-velocity instrumented impact tests were carried out on sandwich panels made of glass fiber-reinforced plastic facesheets and polyurethane foam core. The tests were carried out using a drop weight instrumented impact tester, connected to a data acquisition system. Four different types of sandwich samples using polyester/e-glass and epoxy/e-glass facesheet materials and polyurethane foam were considered for investigation. Two different face sheet materials were chosen to experimentally examine the effect of their elastic modulus on the impact response of the sandwich structures. The data acquisition system records the impact data such as impact force, penetration time and depth of penetration, and plots impact force versus depth of penetration and penetration time versus depth of penetration curves. From the recorded data the impact parameters such as maximum impact force, penetration time and depth of penetration versus impact energy were plotted to study the impact behavior. The results show that higher impact energy is required to break the epoxy/e-glass facesheet and backsheet sandwich specimens than other types of specimens examined. The impact damage caused to the facesheet, the core and the backsheet were thoroughly studied experimentally and the extent of damage caused to the facesheets and the core were also compared by finite element analyses.
{"title":"Low-Velocity Impact Response of Polyurethane Foam Composite Sandwich Structures","authors":"S. C. Sharma, H. N. Narasimha Murthy, M. Krishna","doi":"10.1177/0731684404041141","DOIUrl":"https://doi.org/10.1177/0731684404041141","url":null,"abstract":"Low-velocity instrumented impact tests were carried out on sandwich panels made of glass fiber-reinforced plastic facesheets and polyurethane foam core. The tests were carried out using a drop weight instrumented impact tester, connected to a data acquisition system. Four different types of sandwich samples using polyester/e-glass and epoxy/e-glass facesheet materials and polyurethane foam were considered for investigation. Two different face sheet materials were chosen to experimentally examine the effect of their elastic modulus on the impact response of the sandwich structures. The data acquisition system records the impact data such as impact force, penetration time and depth of penetration, and plots impact force versus depth of penetration and penetration time versus depth of penetration curves. From the recorded data the impact parameters such as maximum impact force, penetration time and depth of penetration versus impact energy were plotted to study the impact behavior. The results show that higher impact energy is required to break the epoxy/e-glass facesheet and backsheet sandwich specimens than other types of specimens examined. The impact damage caused to the facesheet, the core and the backsheet were thoroughly studied experimentally and the extent of damage caused to the facesheets and the core were also compared by finite element analyses.","PeriodicalId":16971,"journal":{"name":"Journal of Reinforced Plastics & Composites","volume":"7 1","pages":"1869 - 1882"},"PeriodicalIF":0.0,"publicationDate":"2004-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89764475","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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