The Experts below are selected from a list of 105 Experts worldwide ranked by ideXlab platform
M Ramji - One of the best experts on this subject based on the ideXlab platform.
-
progressive damage analysis of adhesively bonded patch repaired carbon fibre reinforced Polymer Specimen under compression involving cohesive zone model
International Journal of Damage Mechanics, 2019Co-Authors: Seshadri Matta, Naresh Reddy Kolanu, Viswanath Chinthapenta, C M Manjunatha, M RamjiAbstract:In this paper, the in-plane compression behaviour of open-hole carbon fibre composite Specimens adhesively bonded with the external carbon fibre composite patches on the single- and double side are...
-
Progressive damage analysis of adhesively bonded patch repaired carbon fibre–reinforced Polymer Specimen under compression involving cohesive zone model
'SAGE Publications', 2019Co-Authors: Matta Seshadri, Kolanu, Naresh Reddy, Chinthapenta Viswanath, Manjunatha C M, M RamjiAbstract:In this paper, the in-plane compression behaviour of open-hole carbon fibre composite Specimens adhesively bonded with the external carbon fibre composite patches on the single- and double side are studied. Uniaxial compression tests are conducted on MTS machine using ASTM anti-buckling fixture. A 3D progressive damage model is developed to predict the damage initiation and failure in both unrepaired open cutout and repaired carbon fibre composite Specimens under compressive load. Stress-based 3D-Hashin's failure criteria are used for predicting the fibre and matrix damage in carbon fibre composite. The cohesive zone model element is used for modelling the interlaminar delamination in carbon fibre composite Specimen and also the adhesive layer between patch and Specimen. Initial stiffness, damage initiation load and ultimate load of the Specimen are obtained using progressive damage model based on finite element analysis, and they are compared against the experimental values. The load–deflection curve and the damage progression obtained from finite element analysis using progressive damage model is found to be in good coherence with the experimental predictions. In case of patch bonded carbon fibre composite Specimens, failure mechanism starts with partial patch debonding followed by complete Specimen failure
Scott R. White - One of the best experts on this subject based on the ideXlab platform.
-
Life extension of self-healing Polymers with rapidly growing fatigue cracks
Journal of the Royal Society Interface, 2007Co-Authors: A. S. Jones, Joseph D. Rule, Nancy R Sottos, Jeffrey S. Moore, Scott R. WhiteAbstract:Self-healing Polymers, based on microencapsulated dicyclopentadiene and Grubbs' catalyst embedded in the Polymer matrix, are capable of responding to propagating fatigue cracks by autonomic processes that lead to higher endurance limits and life extension, or even the complete arrest of the crack growth. The amount of fatigue-life extension depends on the relative magnitude of the mechanical kinetics of crack propagation and the chemical kinetics of healing. As the healing kinetics are accelerated, greater fatigue life extension is achieved. The use of wax-protected, recrystallized Grubbs' catalyst leads to a fourfold increase in the rate of Polymerization of bulk dicyclopentadiene and extends the fatigue life of a Polymer Specimen over 30 times longer than a comparable non-healing Specimen. The fatigue life of Polymers under extremely fast fatigue crack growth can be extended through the incorporation of periodic rest periods, effectively training the self-healing Polymeric material to achieve higher endurance limits.
A. S. Jones - One of the best experts on this subject based on the ideXlab platform.
-
Life extension of self-healing Polymers with rapidly growing fatigue cracks
Journal of the Royal Society Interface, 2007Co-Authors: A. S. Jones, Joseph D. Rule, Nancy R Sottos, Jeffrey S. Moore, Scott R. WhiteAbstract:Self-healing Polymers, based on microencapsulated dicyclopentadiene and Grubbs' catalyst embedded in the Polymer matrix, are capable of responding to propagating fatigue cracks by autonomic processes that lead to higher endurance limits and life extension, or even the complete arrest of the crack growth. The amount of fatigue-life extension depends on the relative magnitude of the mechanical kinetics of crack propagation and the chemical kinetics of healing. As the healing kinetics are accelerated, greater fatigue life extension is achieved. The use of wax-protected, recrystallized Grubbs' catalyst leads to a fourfold increase in the rate of Polymerization of bulk dicyclopentadiene and extends the fatigue life of a Polymer Specimen over 30 times longer than a comparable non-healing Specimen. The fatigue life of Polymers under extremely fast fatigue crack growth can be extended through the incorporation of periodic rest periods, effectively training the self-healing Polymeric material to achieve higher endurance limits.
J. C. Seferis - One of the best experts on this subject based on the ideXlab platform.
-
Influence of Polymer Specimen Structure on The Reproducibility of Micro-thermomechanical Transitions
Journal of Thermal Analysis and Calorimetry, 2000Co-Authors: M. S. Tillman, T. Takatoya, B. S. Hayes, J. C. SeferisAbstract:Glass transitions of amorphous polystyrenes with low polydispersity were evaluated using the modulated Local Thermal Analysis mode of the TA Instruments 2990 µ TA and evaluating the thermomechanical signal. Transition temperature variance and fraction of transitions measured were compared for high molecular mass thermosetting materials and the melt of Nylon 6.6. The transition reproducibility was found to decrease as the molecular size of the Polymer samples increased. Reproducibility also decreased for thermosetting materials when the experimental ramp rate was decreased. Heat transfer within the Specimen was evaluated using finite element analysis, allowing scaling of microscale experimental results for comparison to bulk transitions.
H. Daniel Wagner - One of the best experts on this subject based on the ideXlab platform.
-
Measurement of carbon nanotube-Polymer interfacial strength
Applied Physics Letters, 2003Co-Authors: Asa H. Barber, Sidney R. Cohen, H. Daniel WagnerAbstract:The force required to separate a carbon nanotube from a solid Polymer matrix has been measured by performing reproducible nanopullout experiments using atomic force microscopy. The separation stress is found to be remarkably high, indicating that carbon nanotubes are effective at reinforcing a Polymer. These results imply that the Polymer matrix in close vicinity of the carbon nanotube is able to withstand stresses that would otherwise cause considerable yield in a bulk Polymer Specimen.