Ashwini Kumar - Academia.edu (original) (raw)
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Papers by Ashwini Kumar
Composite Structures, 2002
A non-linear ®nite-element method (FEM) which is based on the von Karman's assumptions, the Mindl... more A non-linear ®nite-element method (FEM) which is based on the von Karman's assumptions, the Mindlin's plate theory and the principle of minimum total potential energy is used to study the ®rst-play failure of thin laminated composite plates under combined loading i.e. transverse load with uni-axial compression and transverse load with in-plane shear. The mode of failure, the ®rst failed layer number, the ®rst failed node number and the associated maximum transverse de¯ection are found at dierent values of load combinations. Failure envelopes in the form of interaction curves are obtained for ®ve types of laminate using the Tsai±Hill failure criterion and for AE45=0=90 2s laminate using the other failure criteria as well. Ó
After the advent of chemotherapy for pulmonary tuberculosis, the operation of thoracoplasty becam... more After the advent of chemotherapy for pulmonary tuberculosis, the operation of thoracoplasty became rare in the developed countries. However, this was not the case in developing countries like India. Between July 1992 and June 1997, we performed thoracoplasty in 139 patients. Indications of surgery were tubercular empyema (84 patients), pyogenic empyema (33 patients), post-operative empyema with bronchopleural fistula (8 patients), drug resistant pulmonary tuberculosis (2 patients) and recurrent haemoptysis (2 patients). Successful outcome in the form of control of sepsis, closure of bronchopleural fistula, sputum conversion and control of haemoptysis was achieved in most cases. There were four deaths in the entire series. We conclude that with the persisting problem of pulmonary tuberculosis in the developing countries, thoracoplasty is still an operation of continued relevance.
Composite Structures, 2004
The finite element method is used to study the postbuckling response of symmetric square laminate... more The finite element method is used to study the postbuckling response of symmetric square laminates with a central cutout under uniaxial compression. The formulation is based on Mindlin's plate theory and von Karman's assumptions to incorporate geometric nonlinearity. The ...
Composites Science and Technology, 1998
This paper summarizes a study aimed at understanding the postbuckling behaviour and progressive f... more This paper summarizes a study aimed at understanding the postbuckling behaviour and progressive failure of thin, simply supported symmetric rectangular laminates with various possible in-plane boundary conditions and under the action of in-plane shear loads. First-order shear ...
Composites Science and Technology, 1999
The objective of this work is to study the postbuckling behaviour and progressive failure respons... more The objective of this work is to study the postbuckling behaviour and progressive failure response of thin, symmetric laminates under uniaxial compression and uniaxial compression combined with in-plane shear loads (positive and negative). First-order shear deformation theory ...
Composite Structures, 2002
A non-linear ®nite-element method (FEM) which is based on the von Karman's assumptions, the Mindl... more A non-linear ®nite-element method (FEM) which is based on the von Karman's assumptions, the Mindlin's plate theory and the principle of minimum total potential energy is used to study the ®rst-play failure of thin laminated composite plates under combined loading i.e. transverse load with uni-axial compression and transverse load with in-plane shear. The mode of failure, the ®rst failed layer number, the ®rst failed node number and the associated maximum transverse de¯ection are found at dierent values of load combinations. Failure envelopes in the form of interaction curves are obtained for ®ve types of laminate using the Tsai±Hill failure criterion and for AE45=0=90 2s laminate using the other failure criteria as well. Ó
After the advent of chemotherapy for pulmonary tuberculosis, the operation of thoracoplasty becam... more After the advent of chemotherapy for pulmonary tuberculosis, the operation of thoracoplasty became rare in the developed countries. However, this was not the case in developing countries like India. Between July 1992 and June 1997, we performed thoracoplasty in 139 patients. Indications of surgery were tubercular empyema (84 patients), pyogenic empyema (33 patients), post-operative empyema with bronchopleural fistula (8 patients), drug resistant pulmonary tuberculosis (2 patients) and recurrent haemoptysis (2 patients). Successful outcome in the form of control of sepsis, closure of bronchopleural fistula, sputum conversion and control of haemoptysis was achieved in most cases. There were four deaths in the entire series. We conclude that with the persisting problem of pulmonary tuberculosis in the developing countries, thoracoplasty is still an operation of continued relevance.
Composite Structures, 2004
The finite element method is used to study the postbuckling response of symmetric square laminate... more The finite element method is used to study the postbuckling response of symmetric square laminates with a central cutout under uniaxial compression. The formulation is based on Mindlin's plate theory and von Karman's assumptions to incorporate geometric nonlinearity. The ...
Composites Science and Technology, 1998
This paper summarizes a study aimed at understanding the postbuckling behaviour and progressive f... more This paper summarizes a study aimed at understanding the postbuckling behaviour and progressive failure of thin, simply supported symmetric rectangular laminates with various possible in-plane boundary conditions and under the action of in-plane shear loads. First-order shear ...
Composites Science and Technology, 1999
The objective of this work is to study the postbuckling behaviour and progressive failure respons... more The objective of this work is to study the postbuckling behaviour and progressive failure response of thin, symmetric laminates under uniaxial compression and uniaxial compression combined with in-plane shear loads (positive and negative). First-order shear deformation theory ...