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critical to our nation’s future. High school teachers play an essential role in accomplishing thi... more critical to our nation’s future. High school teachers play an essential role in accomplishing this goal by preparing and encouraging students to pursue STEM fields in college. This paper describes a series of workshops, referred to as TechSTEP, that focus on equipping teachers with tools, techniques, and skills they can immediately implement in their classrooms so as to better prepare students to successfully pursue STEM degrees. The specific workshop described in this paper involves building prototype fuel cell vehicles. In addition to the science of fuel cells and the engineering involved in vehicle design, the project also incorporates a model for natural resource depletion and includes other related economic, environmental, social, and political issues. The ultimate goal of TechSTEP is to increase the number of students successfully pursuing STEM degrees at the university. Even though TechSTEP includes high school students, the primary focus is on high school teachers. We believ...
Journal of Cleaner Production
Polymers
Modern 3D printed components are finding applications in dynamic structures. These structures are... more Modern 3D printed components are finding applications in dynamic structures. These structures are often subject to dynamic loadings. To date, research has mostly focused on investigating the mechanical properties of these 3D printed structures with minimum attention paid to their modal analysis. This work is focused on performing experimental modal analysis of 3D printed structures. The results show that the adhesion type has the most significant impact on the vibration response and parameters obtained from the modal analysis. The average dynamic modulus, natural frequency, and damping coefficient increased by approximately 12.5%, 5.5%, and 36%, respectively, for the specimens printed using skirt adhesion compared to those printed using raft adhesion. SEM analysis suggests that the 3D printed specimens with skirt adhesion yielded flattened layers, while raft adhesion resulted in rounded layers. The flattened layers of the specimens with skirt adhesion are likely an indication of an ...
2007 Annual Conference & Exposition Proceedings
He teaches within the Integrated Engineering Curriculum and Multidisciplinary Senior Design serie... more He teaches within the Integrated Engineering Curriculum and Multidisciplinary Senior Design series. His interests are in promoting collaboration across discipline and college boundaries in order to stimulate innovation and advancements in engineering education. Dr Crittenden received his B.S. and Ph.D. in BioMedical Engineering from Louisiana Tech University.
2003 Annual Conference Proceedings
The sophomore engineering curriculum at Louisiana Tech University includes a mechanics course tha... more The sophomore engineering curriculum at Louisiana Tech University includes a mechanics course that integrates topics from statics and mechanics of materials. This three semester hour course, which is officially listed as 2/3 lecture and 1/3 laboratory, attempts to seamlessly integrate lecture, laboratory, and group problem solving. The laboratory component of the course focuses on the design, fabrication, and testing of a wooden truss made from 3/8 inch and/or ¼ inch wooden dowels supported at the joints by small wooden blocks. The truss span, which ranges from 30 inches to 50 inches, and the loading configuration are varied each term. Three potential modes of failure are evaluated, including dowel fracture due to excessive axial stress, dowel pull-out due to shear failure of the glued joint, and dowel buckling for members in compression. Over the past couple of years, we have developed experiments to quantify the tendency of a given member to fail in each of these three modes. Prior to initiating the truss design, students determine the strength and modulus of the dowels, the shearing strength of the glued joints and the buckling strength of the dowels as a function of length. Armed with this information, student teams evaluate potential truss designs and optimize their chosen configuration to support the maximum load or maximum load divided by truss weight. These trusses, which weigh less than 10 lbs and sometimes support over 3,000 lbs, are built using simple tools and require minimal faculty supervision during construction. This paper will describe all aspects of the project, including truss design rules, the method of fabrication, associated experiments, testing fixtures, testing equipment, and testing procedures.
2007 Annual Conference & Exposition Proceedings
He teaches within the Integrated Engineering Curriculum and Multidisciplinary Senior Design serie... more He teaches within the Integrated Engineering Curriculum and Multidisciplinary Senior Design series. His interests are in promoting collaboration across discipline and college boundaries in order to stimulate innovation and advancements in engineering education. Dr Crittenden received his B.S. and Ph.D. in BioMedical Engineering from Louisiana Tech University.
Sliding hip screws are routinely used to repair Garden III femoral neck fractures. This research ... more Sliding hip screws are routinely used to repair Garden III femoral neck fractures. This research seeks to better understand the influence o f the hip screw angle on the performance o f the fixation. The mechanics o f fractured femurs repaired with 135and 150-degree sliding fixation devices are explored using experimental, finite element, and analytical modeling. The experimental study involves testing of both intact and fixated femurs; the finite element work centers on two-dimensional models o f intact and fixated femurs; and the analytical modeling explores the forces, moments and stresses in the fixation. The analytical model predicts that the screw will serve as a hinge point leading to compressive contact forces across the fracture faces below the screw. The peak stresses I the screw are seen to be a function o f the installation position of the screw on the fracture plane. Screw are seen to have lower stresses when they are installed low on the fracture plane, especially in th...
2012 ASEE Annual Conference & Exposition Proceedings
2012 ASEE Annual Conference & Exposition Proceedings
2008 Annual Conference & Exposition Proceedings
2008 Annual Conference & Exposition Proceedings
2008 Annual Conference & Exposition Proceedings
2008 Annual Conference & Exposition Proceedings
2011 ASEE Annual Conference & Exposition Proceedings
2013 ASEE Annual Conference & Exposition Proceedings
2016 ASEE Annual Conference & Exposition Proceedings, 2000
Abstract Students beginning the first year of an engineering program,generally have limited exper... more Abstract Students beginning the first year of an engineering program,generally have limited experience with the tools engineers can harness to solve problems. Teaching students how to use problem solving tools at the point when they fully appreciate the nature of a problem is a powerful method,of instruction. Real problems do not present themselves in response to the existenceof a tool; rather, tools are developed to assist in solving existing problems.
Louisiana Tech University's College of Engineering and Science has established the vision to ... more Louisiana Tech University's College of Engineering and Science has established the vision to "be the best college in the world at integrating engineering and science in education and research." We believe implementation of this vision is the most effective way for Louisiana Tech to significantly increase the number of highly-qualified STEM graduates entering the workforce. To accomplish this vision we have initiated several interconnected programs which will result in increased recruitment and retention of STEM students. We began our efforts toward achieving this vision with our first Integrated Engineering Curriculum in 1997 followed by our Integrated Science Curriculum in 2002, both of which were supported by NSF funding. Since that initial funding, several additional programs have been created. Success of these programs depends not only on the quality of each individual program but also on the synergy between them. The purpose of this paper is to describe these prog...
critical to our nation’s future. High school teachers play an essential role in accomplishing thi... more critical to our nation’s future. High school teachers play an essential role in accomplishing this goal by preparing and encouraging students to pursue STEM fields in college. This paper describes a series of workshops, referred to as TechSTEP, that focus on equipping teachers with tools, techniques, and skills they can immediately implement in their classrooms so as to better prepare students to successfully pursue STEM degrees. The specific workshop described in this paper involves building prototype fuel cell vehicles. In addition to the science of fuel cells and the engineering involved in vehicle design, the project also incorporates a model for natural resource depletion and includes other related economic, environmental, social, and political issues. The ultimate goal of TechSTEP is to increase the number of students successfully pursuing STEM degrees at the university. Even though TechSTEP includes high school students, the primary focus is on high school teachers. We believ...
Journal of Cleaner Production
Polymers
Modern 3D printed components are finding applications in dynamic structures. These structures are... more Modern 3D printed components are finding applications in dynamic structures. These structures are often subject to dynamic loadings. To date, research has mostly focused on investigating the mechanical properties of these 3D printed structures with minimum attention paid to their modal analysis. This work is focused on performing experimental modal analysis of 3D printed structures. The results show that the adhesion type has the most significant impact on the vibration response and parameters obtained from the modal analysis. The average dynamic modulus, natural frequency, and damping coefficient increased by approximately 12.5%, 5.5%, and 36%, respectively, for the specimens printed using skirt adhesion compared to those printed using raft adhesion. SEM analysis suggests that the 3D printed specimens with skirt adhesion yielded flattened layers, while raft adhesion resulted in rounded layers. The flattened layers of the specimens with skirt adhesion are likely an indication of an ...
2007 Annual Conference & Exposition Proceedings
He teaches within the Integrated Engineering Curriculum and Multidisciplinary Senior Design serie... more He teaches within the Integrated Engineering Curriculum and Multidisciplinary Senior Design series. His interests are in promoting collaboration across discipline and college boundaries in order to stimulate innovation and advancements in engineering education. Dr Crittenden received his B.S. and Ph.D. in BioMedical Engineering from Louisiana Tech University.
2003 Annual Conference Proceedings
The sophomore engineering curriculum at Louisiana Tech University includes a mechanics course tha... more The sophomore engineering curriculum at Louisiana Tech University includes a mechanics course that integrates topics from statics and mechanics of materials. This three semester hour course, which is officially listed as 2/3 lecture and 1/3 laboratory, attempts to seamlessly integrate lecture, laboratory, and group problem solving. The laboratory component of the course focuses on the design, fabrication, and testing of a wooden truss made from 3/8 inch and/or ¼ inch wooden dowels supported at the joints by small wooden blocks. The truss span, which ranges from 30 inches to 50 inches, and the loading configuration are varied each term. Three potential modes of failure are evaluated, including dowel fracture due to excessive axial stress, dowel pull-out due to shear failure of the glued joint, and dowel buckling for members in compression. Over the past couple of years, we have developed experiments to quantify the tendency of a given member to fail in each of these three modes. Prior to initiating the truss design, students determine the strength and modulus of the dowels, the shearing strength of the glued joints and the buckling strength of the dowels as a function of length. Armed with this information, student teams evaluate potential truss designs and optimize their chosen configuration to support the maximum load or maximum load divided by truss weight. These trusses, which weigh less than 10 lbs and sometimes support over 3,000 lbs, are built using simple tools and require minimal faculty supervision during construction. This paper will describe all aspects of the project, including truss design rules, the method of fabrication, associated experiments, testing fixtures, testing equipment, and testing procedures.
2007 Annual Conference & Exposition Proceedings
He teaches within the Integrated Engineering Curriculum and Multidisciplinary Senior Design serie... more He teaches within the Integrated Engineering Curriculum and Multidisciplinary Senior Design series. His interests are in promoting collaboration across discipline and college boundaries in order to stimulate innovation and advancements in engineering education. Dr Crittenden received his B.S. and Ph.D. in BioMedical Engineering from Louisiana Tech University.
Sliding hip screws are routinely used to repair Garden III femoral neck fractures. This research ... more Sliding hip screws are routinely used to repair Garden III femoral neck fractures. This research seeks to better understand the influence o f the hip screw angle on the performance o f the fixation. The mechanics o f fractured femurs repaired with 135and 150-degree sliding fixation devices are explored using experimental, finite element, and analytical modeling. The experimental study involves testing of both intact and fixated femurs; the finite element work centers on two-dimensional models o f intact and fixated femurs; and the analytical modeling explores the forces, moments and stresses in the fixation. The analytical model predicts that the screw will serve as a hinge point leading to compressive contact forces across the fracture faces below the screw. The peak stresses I the screw are seen to be a function o f the installation position of the screw on the fracture plane. Screw are seen to have lower stresses when they are installed low on the fracture plane, especially in th...
2012 ASEE Annual Conference & Exposition Proceedings
2012 ASEE Annual Conference & Exposition Proceedings
2008 Annual Conference & Exposition Proceedings
2008 Annual Conference & Exposition Proceedings
2008 Annual Conference & Exposition Proceedings
2008 Annual Conference & Exposition Proceedings
2011 ASEE Annual Conference & Exposition Proceedings
2013 ASEE Annual Conference & Exposition Proceedings
2016 ASEE Annual Conference & Exposition Proceedings, 2000
Abstract Students beginning the first year of an engineering program,generally have limited exper... more Abstract Students beginning the first year of an engineering program,generally have limited experience with the tools engineers can harness to solve problems. Teaching students how to use problem solving tools at the point when they fully appreciate the nature of a problem is a powerful method,of instruction. Real problems do not present themselves in response to the existenceof a tool; rather, tools are developed to assist in solving existing problems.
Louisiana Tech University's College of Engineering and Science has established the vision to ... more Louisiana Tech University's College of Engineering and Science has established the vision to "be the best college in the world at integrating engineering and science in education and research." We believe implementation of this vision is the most effective way for Louisiana Tech to significantly increase the number of highly-qualified STEM graduates entering the workforce. To accomplish this vision we have initiated several interconnected programs which will result in increased recruitment and retention of STEM students. We began our efforts toward achieving this vision with our first Integrated Engineering Curriculum in 1997 followed by our Integrated Science Curriculum in 2002, both of which were supported by NSF funding. Since that initial funding, several additional programs have been created. Success of these programs depends not only on the quality of each individual program but also on the synergy between them. The purpose of this paper is to describe these prog...
2009 39th IEEE Frontiers in Education Conference, 2009