Composites Engineering最新文献_第3页

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

Taguchi analysis of heat treatment variables on the mechanical behavior of alumina/aluminum metal matrix composites 热处理变量对氧化铝/铝金属基复合材料力学行为的影响

Composites Engineering Pub Date : 1995-01-01 DOI: 10.1016/0961-9526(95)90709-K

G. Leisk, A. Saigal

引用次数: 13

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

Ultrasonic and vibration methods for the characterization of pultruded composites 拉挤复合材料的超声和振动表征方法

Composites Engineering Pub Date : 1995-01-01 DOI: 10.1016/0961-9526(95)00074-W

Krishnan Balasubramaniam, Satyanarayana Alluri, Praveen Nidumolu, P.Raju Mantena, James G. Vaughan, Murthy Kowsika

{"title":"Ultrasonic and vibration methods for the characterization of pultruded composites","authors":"Krishnan Balasubramaniam, Satyanarayana Alluri, Praveen Nidumolu, P.Raju Mantena, James G. Vaughan, Murthy Kowsika","doi":"10.1016/0961-9526(95)00074-W","DOIUrl":"10.1016/0961-9526(95)00074-W","url":null,"abstract":"<div>Characterization of unidirectional fiber reinforced glass/epoxy pultruded composites using ultrasonics (high frequency, 1-5 MHz) and the impulse-frequency response vibration (intermediate frequency, 50-100 Hz) technique, is demonstrated here. This paper compares the response of both of these non-destructive test techniques to the changes in the pultrusion process variables and to the indeed contaminants introduced during manufacturing. The ultrasonic methods use multi-mode techniques of wave velocity and attenuation measurements to measure the viscoelastic constants of the pultruded composite while the vibration technique provides the dynamic flexural modulus and loss factor (damping) measurements. Quasi-destructive assays were also performed using a low frequency (1-50 Hz) Dynamic Mechanical Analyser (DMA) to verify the state of pultruded samples with induced contaminants (simulated porosity and interfacial debonding) and the results compared with the non-destructive measurements. Mathematical models to describe the influence of porosity and debonding agents on the material properties were derived based on statistical regression analysis procedures. Results indicate that the peak damping value of the tan δ curve obtained from the DMA is a sensitive parameter to detect abnormalities in the finished product. The ultrasonic velocity and dynamic flexural modulus measurements provide useful information on the stiffness characteristics while the attention and loss factor can be related to the anomaly-sensitive damping properties of the material.</div>","PeriodicalId":100298,"journal":{"name":"Composites Engineering","volume":"5 12","pages":"Pages 1433-1451"},"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)00074-W","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88812795","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: 15

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>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 from the top and from the bottom limits for any transverse stress component on the interfaces. On the contrary, when using deficient approximation functions one obtains the same from the top and from the bottom limits for the transverse stresses on the interfaces.</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

Delamination analysis by damage mechanics: Some applications 损伤力学的分层分析:一些应用

Composites Engineering Pub Date : 1995-01-01 DOI: 10.1016/0961-9526(95)93976-3

L. Daudeville , O. Allix , P. Ladevèze

引用次数: 146

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

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

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

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>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/Al203 metal-metal oxide multilayered nanocomposite system fabricated by the JVD process. The 10μm thick <math><mtext>Al</mtext><mtext>Cu</mtext></math> 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 <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> 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/Al2O3 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 <math><mtext>Al</mtext><mtext>Cu</mtext></math> 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/Al2O3 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.</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