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Papers by Kaushik Mallick

Research paper thumbnail of A phenomenological model on the deformation mechanism of YBa2Cu3O7?x +Ag2O composite

Journal of Materials Science Letters, 1990

Research paper thumbnail of Prediction of Pressure Cycle Induced Microcrack Damage in Linerless Composite Tanks

47th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference<BR> 14th AIAA/ASME/AHS Adaptive Structures Conference<BR> 7th, 2006

The public reporting burden for this collection of information is estimated to average 1 hour per... more The public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing this burden, to Department of Defense, Washington Headquarters Services, Directorate for Information Operations and Reports (0704-0188), 1215 Jefferson Davis Highway, Suite 1204, Arlington, VA 22202-4302. Respondents should be aware that notwithstanding any other provision of law, no person shall be subject to any penalty for failing to comply with a collection of information if it does not display a currently valid OMB control number.

Research paper thumbnail of Ultralight Linerless Composite Tanks for In-Space Applications

Space 2004 Conference and Exhibit, 2004

NASA missions are becoming increasingly more demanding of propulsion capability, driving the mass... more NASA missions are becoming increasingly more demanding of propulsion capability, driving the mass of propulsion systems higher, even as the science mass of electronics is reduced. Typically, the propulsion tank is the single largest highest dry mass item of an inspace propulsion system. Ultralight linerless composite tanks (ULLCTs) promise to achieve the efficiencies that will make future propulsion systems viable and minimize propulsion system mass growth. ULLCTS may offer up to a 25 percent weight reduction compared to conventional metal lined composite overwrapped tanks, allowing increased reactant storage and/or reduced launch mass. For successful design of such a tank, the composite shell itself is required to provide an integral impermeable barrier, in addition to carrying the pressure and environmental loads for in-space propulsion. Significant materials technologies are required to achieve the microcrack resistance of the composites in order to contain small molecule gases such as helium (He). The goal is to develop a material that can limit the leakage rate of gaseous He to lo4 scclsec a t 1% biaxial strain level. The current paper details an integrated systematic approach to developing novel composite materials that can meet such performance requirements. It also explains how micromechanical models and material testing can be combined to define material performance indicators critical for designing an ULLCT, such as the material's resistance to microcracking and permeability.

Research paper thumbnail of An Integrated Systematic Approach to Linerless Composite Tank Development

46th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference, 2005

Public reporting burden for this collection of information is estimated to average 1 hour per res... more Public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing this collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing this burden to Department of Defense, Washington Headquarters Services, Directorate for Information Operations and Reports (0704-0188), 1215 Jefferson Davis Highway, Suite 1204, Arlington, VA 22202-4302. Respondents should be aware that notwithstanding any other provision of law, no person shall be subject to any penalty for failing to comply with a collection of information if it does not display a currently valid OMB control number.

Research paper thumbnail of Micromechanics of the progress induced damage evolution in thermosets

Journal of the Mechanics and Physics of Solids, 1995

The present study focuses on the formulation of a micromechanically based analytical model of the... more The present study focuses on the formulation of a micromechanically based analytical model of the evolution of damage in thermoset resins during cure. The study emphasizes the effect of the microstructural disorder on the macro response. To avoid introduction of arbitrary fitting constants and parameters the problem is considered on three different length scales. The proposed model consists of a system of equations governing the exothermic chemical reaction, heat transfer and deformation. Effective properties of the solid and distribution of stresses are determined using non-traditional micromechanical models.

Research paper thumbnail of A phenomenological model on the deformation mechanism of YBa2Cu3O7?x +Ag2O composite

Journal of Materials Science Letters, 1990

Research paper thumbnail of Prediction of Pressure Cycle Induced Microcrack Damage in Linerless Composite Tanks

47th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference<BR> 14th AIAA/ASME/AHS Adaptive Structures Conference<BR> 7th, 2006

The public reporting burden for this collection of information is estimated to average 1 hour per... more The public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing this burden, to Department of Defense, Washington Headquarters Services, Directorate for Information Operations and Reports (0704-0188), 1215 Jefferson Davis Highway, Suite 1204, Arlington, VA 22202-4302. Respondents should be aware that notwithstanding any other provision of law, no person shall be subject to any penalty for failing to comply with a collection of information if it does not display a currently valid OMB control number.

Research paper thumbnail of Ultralight Linerless Composite Tanks for In-Space Applications

Space 2004 Conference and Exhibit, 2004

NASA missions are becoming increasingly more demanding of propulsion capability, driving the mass... more NASA missions are becoming increasingly more demanding of propulsion capability, driving the mass of propulsion systems higher, even as the science mass of electronics is reduced. Typically, the propulsion tank is the single largest highest dry mass item of an inspace propulsion system. Ultralight linerless composite tanks (ULLCTs) promise to achieve the efficiencies that will make future propulsion systems viable and minimize propulsion system mass growth. ULLCTS may offer up to a 25 percent weight reduction compared to conventional metal lined composite overwrapped tanks, allowing increased reactant storage and/or reduced launch mass. For successful design of such a tank, the composite shell itself is required to provide an integral impermeable barrier, in addition to carrying the pressure and environmental loads for in-space propulsion. Significant materials technologies are required to achieve the microcrack resistance of the composites in order to contain small molecule gases such as helium (He). The goal is to develop a material that can limit the leakage rate of gaseous He to lo4 scclsec a t 1% biaxial strain level. The current paper details an integrated systematic approach to developing novel composite materials that can meet such performance requirements. It also explains how micromechanical models and material testing can be combined to define material performance indicators critical for designing an ULLCT, such as the material's resistance to microcracking and permeability.

Research paper thumbnail of An Integrated Systematic Approach to Linerless Composite Tank Development

46th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference, 2005

Public reporting burden for this collection of information is estimated to average 1 hour per res... more Public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing this collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing this burden to Department of Defense, Washington Headquarters Services, Directorate for Information Operations and Reports (0704-0188), 1215 Jefferson Davis Highway, Suite 1204, Arlington, VA 22202-4302. Respondents should be aware that notwithstanding any other provision of law, no person shall be subject to any penalty for failing to comply with a collection of information if it does not display a currently valid OMB control number.

Research paper thumbnail of Micromechanics of the progress induced damage evolution in thermosets

Journal of the Mechanics and Physics of Solids, 1995

The present study focuses on the formulation of a micromechanically based analytical model of the... more The present study focuses on the formulation of a micromechanically based analytical model of the evolution of damage in thermoset resins during cure. The study emphasizes the effect of the microstructural disorder on the macro response. To avoid introduction of arbitrary fitting constants and parameters the problem is considered on three different length scales. The proposed model consists of a system of equations governing the exothermic chemical reaction, heat transfer and deformation. Effective properties of the solid and distribution of stresses are determined using non-traditional micromechanical models.