Composites Engineering最新文献_第3页

Laser effects on the dynamic response of laminated composites 激光对层合复合材料动态响应的影响

Composites Engineering Pub Date : 1995-01-01 DOI: 10.1016/0961-9526(95)00049-S

J.K. Chen, A. Perea, F.A. Allahdadi

{"title":"Laser effects on the dynamic response of laminated composites","authors":"J.K. Chen, A. Perea, F.A. Allahdadi","doi":"10.1016/0961-9526(95)00049-S","DOIUrl":"https://doi.org/10.1016/0961-9526(95)00049-S","url":null,"abstract":"<div><p>Transient response of a moving composite laminate suddenly subjected to combined mechanical load and high intensity laser irradiation was investigated. The three thermal effects, which are caused by rapid laser heating and influence the structure's dynamic behavior, are material property degradation, burn-out and induced thermal loading. To determine temperature distribution and material burn-out due to the high laser energy deposition, a modified Crank-Nicholson finite difference scheme, which includes the effects of surface ablation, degradation of thermophysical properties at elevated temperatures and heat losses from radiation and convection, was employed. The predicted thermal results were then used for thermal loading calculation and, subsequently, forced vibration analysis. Both small and large deflection composite plate theories were adopted. The inclusion of temperature-dependent mechanical properties in the analysis was also of particular importance. It was shown that the escalation or reduction of vibration response of a laminated composite subjected to transverse loads by laser irradiation depends not only upon the laser intensity, but also, which plate surface is irradiated. It was also found that a higher power laser irradiation ensures neither greater escalation not reduction of the vibration.</p></div>","PeriodicalId":100298,"journal":{"name":"Composites Engineering","volume":"5 9","pages":"Pages 1135-1147"},"PeriodicalIF":0.0,"publicationDate":"1995-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0961-9526(95)00049-S","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91754484","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}

引用次数: 11

A comparison of various 3-D approaches for the analysis of laminated composite structures 层合复合材料结构三维分析方法的比较

Composites Engineering Pub Date : 1995-01-01 DOI: 10.1016/0961-9526(94)00080-S

A.E. Bogdanovich, C.M. Pastore, B.P. Deepak

{"title":"A comparison of various 3-D approaches for the analysis of laminated composite structures","authors":"A.E. Bogdanovich, C.M. Pastore, B.P. Deepak","doi":"10.1016/0961-9526(94)00080-S","DOIUrl":"10.1016/0961-9526(94)00080-S","url":null,"abstract":"<div><p>Three computational approaches for 3-D analysis of laminated composite plates are presented. These are displacement assumed approach, displacement assumed/equilibrium approach and mixed two-field approach. The fundamental concept in all of the three approaches is that “deficient” polynomials have to be used for the through-the-thickness displacement approximation. Bernstein polynomials, having discontinuous first derivatives at the interfaces, are used as approximation functions in the through-the-thickness direction. The examples of a double-sine distributed surface load on 3-ply, 9-ply, and sandwich plates examined by Pagano are solved. It is shown that the results obtained with all three present approaches agree excellently with the closed form solution, for the length-to-thickness aspect ratios ranging from 2–100. A comparison between the results obtained with the deficient and with the continuously differentiable displacement approximations is also presented. This reveals that polynomial approximations that are continuously differentiable through the whole thickness of a laminate, provide qualitatively incorrect transverse stresses at the interfaces. By increasing the degree of the polynomial, one gets two distinct <em>from the top</em> and <em>from the bottom</em> limits for any transverse stress component on the interfaces. On the contrary, when using deficient approximation functions one obtains the same <em>from the top</em> and <em>from the bottom</em> limits for the transverse stresses on the interfaces.</p></div>","PeriodicalId":100298,"journal":{"name":"Composites Engineering","volume":"5 9","pages":"Pages 1105-1126"},"PeriodicalIF":0.0,"publicationDate":"1995-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0961-9526(94)00080-S","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87361068","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}

引用次数: 13

Effects of band weaving on fiber strength in filament-wound composite structures 带织对长丝缠绕复合材料纤维强度的影响

Composites Engineering Pub Date : 1995-01-01 DOI: 10.1016/0961-9526(94)00103-G

Kurt Gramoll, Srinivasan Ramaprasad

引用次数: 6

Artificially layered nanocomposites fabricated by jet vapor deposition 射流气相沉积制备层状纳米复合材料

Composites Engineering Pub Date : 1995-01-01 DOI: 10.1016/0961-9526(95)00034-K

H.N.G. Wadley, L.M. Hsiung, R.L. Lankey

{"title":"Artificially layered nanocomposites fabricated by jet vapor deposition","authors":"H.N.G. Wadley, L.M. Hsiung, R.L. Lankey","doi":"10.1016/0961-9526(95)00034-K","DOIUrl":"10.1016/0961-9526(95)00034-K","url":null,"abstract":"<div><p>Novel jet vapor deposition (JVD) processes offer considerable promise for the inexpensive synthesis of functionally graded (composite) materials (FGMs). Here, we explore microstructure-mechanical property relationships for a model Al/Cu metal-metal system and an Al/Al<sub>2</sub>0<sub>3</sub> metal-metal oxide multilayered nanocomposite system fabricated by the JVD process. The 10μm thick <span><math><mtext>Al</mtext><mtext>Cu</mtext></math></span> multilayers were deposited on silicon wafers at a substrate temperature of ∼140°C. The A1 and Cu layers were of approximately equal thickness and were systematically varied from ∼20 to ∼1000 nm. The 20μm thick <span><math><mtext>rmAl</mtext><mtext>Al</mtext><msub><mi></mi><mn>2</mn></msub><mtext>O</mtext><msub><mi></mi><mn>3</mn></msub></math></span> multilayers were deposited on glass slides at ∼250°C. The oxide layer thickness was held constant in the ∼2–6 nm range, whilst the Al layer thickness was systematically varied from ∼3 to ∼50 nm. The structure of the Al/Cu multilayers was polycrystalline and had a strong [111] texture, whereas the Al/Al<sub>2</sub>O<sub>3</sub> multilayers consisted of amorphous aluminum oxide layers and polycrystalline metal layers with randomly oriented grains. The yield strength of the Al/Cu multilayers exhibited an inverse dependence upon layer thickness when the layer spacing exceeded ∼50 nm. When the <span><math><mtext>Al</mtext><mtext>Cu</mtext></math></span> layer spacing was thinner than ∼50 nm, the strength was better predicted by a Koehler image force model. A similar phenomenon was also found in the Al/Al<sub>2</sub>O<sub>3</sub> multilayers. In this case the critical metal layer thickness for the transition from an Orowan to a Koehler type behavior was approximately 25 nm. This is consistent with theoretical predictions which indicate that the critical layer thickness of the low modulus consistuent decreases as the difference in shear moduli between the two constituent layers increases.</p></div>","PeriodicalId":100298,"journal":{"name":"Composites Engineering","volume":"5 7","pages":"Pages 935-945, 947-950"},"PeriodicalIF":0.0,"publicationDate":"1995-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0961-9526(95)00034-K","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88525258","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}

引用次数: 8

Transient displacements of a composite medium with defects due to a surface pulse 含有表面脉冲缺陷的复合介质的瞬态位移

Composites Engineering Pub Date : 1995-01-01 DOI: 10.1016/0961-9526(95)00075-X

R.K.N.D. Rajapakse, D. Gross

引用次数: 0

Stress-strength interference theory for a pin-loaded composite joint 销加载复合材料节点的应力-强度干涉理论

Composites Engineering Pub Date : 1995-01-01 DOI: 10.1016/0961-9526(94)00063-F

Paul D. Herrington

引用次数: 12

Torsion and flexure of inhomogeneous elements 非均匀单元的扭转和弯曲

Composites Engineering Pub Date : 1995-01-01 DOI: 10.1016/0961-9526(95)00043-M

Frank J. Rooney, M. Ferrari

引用次数: 47

Fracture propagation near a frictionally - constrained fiber interface 摩擦约束纤维界面附近的断裂扩展

Composites Engineering Pub Date : 1995-01-01 DOI: 10.1016/0961-9526(95)93977-4

Michael C. Larson

{"title":"Fracture propagation near a frictionally - constrained fiber interface","authors":"Michael C. Larson","doi":"10.1016/0961-9526(95)93977-4","DOIUrl":"10.1016/0961-9526(95)93977-4","url":null,"abstract":"<div><p>This work provides a three-dimensional numerical fracture mechanics analysis of a crack periphery as it propagates through a brittle matrix and encounters an individual brittle fiber. The surface integral method, based upon a distribution of singular fundamental solutions, is used to represent both the cracks and the coupled interfacial sliding zone. The interfacial frictional tractions are assumed to satisfy a Coulomb relationship and are determined iteratively from the stress induced by the matrix crack, the stress induced by the developing slip, and the initial normal compressive interfacial stress (i.e. from setting or thermal mismatch). Simulations of an initially long straight crack front moving toward and past a fiber for different interfacial frictional characteristics were conducted. The implications for tailoring fiber/matrix interfaces to optimize the global toughening effect are discussed. If the interface between fiber and matrix is cohesive enough (but not too cohesive) then tractions which develop at the interface may effectively retard the local growth of a matrix crack. Raising the friction coefficient (or cohesion) at the interface must, however, be balanced against the potential for fiber failure in the high stress zone near the matrix crack periphery. The implications frictional slippage holds for inhibiting and possibly arresting small matrix cracks are emphasized.</p></div>","PeriodicalId":100298,"journal":{"name":"Composites Engineering","volume":"5 1","pages":"Pages 25-36"},"PeriodicalIF":0.0,"publicationDate":"1995-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0961-9526(95)93977-4","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75630430","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}

引用次数: 6

Modeling of stiffness degradation of the interfacial zone during fiber debonding 纤维脱胶过程中界面区刚度退化的建模

Composites Engineering Pub Date : 1995-01-01 DOI: 10.1016/0961-9526(95)00056-S

B. Mobasher, Cheng Yu Li

引用次数: 26

Non-linear numerical study of the single-fiber fragmentation test. Part II: A parametric study 单纤维断裂试验的非线性数值研究。第二部分：参数研究

Composites Engineering Pub Date : 1995-01-01 DOI: 10.1016/0961-9526(95)00055-R

H. Ho, L.T. Drzal

引用次数: 16