Curing Deformation Analysis for the Composite T-shaped Integrated Structures

Li, Jun; Yao, Xuefeng; Liu, Yinghua; Chen, ShenShen; Kou, Zhejun; Dai, Dongjuan

doi:10.1007/s10443-008-9068-0

Cited by 24 publications

(12 citation statements)

References 15 publications

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“…Different polyolefins, e.g., HDPE, LDPE, polypropylene (PP) etc., as a homogeneous thermoplastic matrix were widely used for manufacturing of natural fiber reinforced composites. [23][24][25][26][27][28] These composites exhibited poor impact resistance particularly at low temperature, which considerably limits their application spectrum. However, the impact strength of the polyolefins was improved by blending with thermoplastic elastomer (e.g., EPDM).…”

Section: Introductionmentioning

confidence: 99%

Dynamic mechanical and thermal properties of PE‐EPDM based jute fiber composites

Sarkhel

Choudhury

2008

J of Applied Polymer Sci

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The present investigation deals with the mechanical, thermal and viscoelastic properties of ternary composites based on low density polyethylene (LDPE)-ethylene-propylene-diene terpolymer (EPDM) blend and high density polyethylene (HDPE)-EPDM blend reinforced with short jute fibers. For all the untreated and compatibilizer treated composites, the variation of mechanical and viscoelastic properties as a function of fiber loading (10, 20 and 30 wt %) and compatibilizer concentration (1, 2, and 3%) were evaluated. The flexural strength, flexural modulus, impact strength, and hardness increased with increasing both the fiber loading and the compatibilizer dose. The storage modulus (E 0 ) and loss modulus (E 00 ) of the HDPE-EPDM/jute fiber composites were recorded higher compared to those of the LDPE-EPDM/jute fiber composites at all level of fiber loading and compatibilizer doses. The tan d (damping efficiency) spectra showed a strong influence of the fiber loading and compatibilizer dose on the a relaxation process of polymer matrix in the composite. The thermo-oxidative stability was significantly enhanced for treated composites compared to untreated composites. Scanning electron microscopy investigation confirmed that the higher values of mechanical and viscoelastic properties of the treated composites compared to untreated composites is caused by improvement of fiber-matrix adhesion as result of compatibilizer treatment.

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Section: Introductionmentioning

confidence: 99%

Dynamic mechanical and thermal properties of PE‐EPDM based jute fiber composites

Sarkhel

Choudhury

2008

J of Applied Polymer Sci

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“…It has been observed in experiments that the crack doesn't remain within the two surfaces specified at the outset. It actually has a tendency to jump to the next ply and so on (Chen et al, 2008). It would therefore be useful to have a computational technique which would allow for such behavior.…”

Section: Propagation Runsmentioning

confidence: 98%

“…The out-of-plane load on the stiffener web is the critical load condition leading the noodle to failure. Additionally, during manufacturing of the stiffened composite structures, curved regions such as the noodle are more susceptible to processing defects in the form of resin rich pockets, dry spots or voids which are typically difficult to inspect (Li et al, 2006;Li et al, 2008;Yue et al, 2010). Innovative techniques of reinforcing the T-section in the out of plane direction using Z-pins or transverse stitching are being investigated (Stickler, 2006).…”

Section: Introductionmentioning

confidence: 98%

Delamination Modeling in Noodle Region of Composite T-Joints

Ansari

Gururaja

2013

54th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference

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Delamination onset and propagation of an initial radial disbond in the noodle region of a T-section has been studied in detail. Pull-out loading coupled with residual stresses due to curing has been accounted for in the analysis. A rigorous finite element analysis in conjunction with virtual crack closure technique has been adopted to model delamination onset and growth. Thickness variation due to increasing number of plies and tool geometry variation has been quantified. Residual stresses due to curing are found to be very detrimental to the load-carrying capability of the T-joint. Nomenclature E 1, E 2, E 3 = Elastic moduli in 1-, 2-and 3-material directions G 12 = In-plane shear modulus G 23, G 31 = Transverse shear moduli ν 12, ν 23, ν 31 = Equivalent SERR calculated at a node G eqC = Critical equivalent SERR calculated at a node a m , a n , a o = Empirical constants for mixed-mode criterion (power law) ∆T = Temperature change due to curing

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“…Compared with the prohibitively expensive method of iterative testing, FEM simulations based on the physical model are now mature and increasingly accepted techniques for process simulation and optimization of composite structures. Recently, there are a number of studies developed to support the prediction of different quality issues in polymer composite processes such as stability of composite structures [12,13], porosity [14][15][16][17][18], un-uniform cure degree [19], delamination [20,21], residual strains [22], etc.…”

Section: Related Researchmentioning

confidence: 99%

Methodology for Evaluating Manufacturability of Composite Materials

Cong

Zhang

2011

Appl Compos Mater

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It is widely acknowledged that decisions made in the early design stages have a greater influence on the final product than those made in the later stages. In a conventional design process, composite products are designed without sufficient consideration being given to limitations of composite manufacturing process. Quite often some of composite designs cannot be produced with special performance requirement or cannot be produced at a reasonable cost. To resolve this drawback and achieve the competitive designs for composite product, an integrated knowledge framework that supports the quantitative manufacturability evaluation of composite design proposals was introduced. The essential concept of the composite manufacturability was defined through an in-depth analysis of composite manufacturing process. The evaluation flow was acquired according to the hierarchical indices. A stage-based quality assessment model for the composite multistage process was mainly studies. It relies on the consideration that the final quality of a composite product is mainly determined by some critical stages during a production cycle. Finally, the method is illustrated through a case focusing on the quality issue of void formation in autoclave process.

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Curing Deformation Analysis for the Composite T-shaped Integrated Structures

Cited by 24 publications

References 15 publications

Dynamic mechanical and thermal properties of PE‐EPDM based jute fiber composites

Dynamic mechanical and thermal properties of PE‐EPDM based jute fiber composites

Delamination Modeling in Noodle Region of Composite T-Joints

Methodology for Evaluating Manufacturability of Composite Materials

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