Saadi Habib






Participant: PROMISE AGEP Research Symposium, 2014

Saadi Habib
: Mechanical Engineering
Institution: University of Maryland, Baltimore County (UMBC)




Anisotropy and strain rate sensitivity of magnesium alloy ZEK100 at different strain rates and temperature

Mechanical response of magnesium alloy ZEK100 in sheet was tested under uniaxial (tension and compression) loading along the rolling direction (RD), 45° to rolling direction (DD), and transverse direction (TD) at strain rates of 10-4 to 2.4×103 s-1 and at temperature of 25 and 150°C. Magnesium alloy sheet has hexagonal close packed (HCP) crystal structure and crystallographic texture due to material sheet forming causing strong anisotropic and asymmetric behavior. Data shows yielding and strain hardening is dependent on strain rate and temperature in addition to orientation. The yield strength is the greatest along the RD and decreases towards TD. Jump test and monotonic test where also used to find strain rate sensitivity (SRS) along three different directions. Results show SRS to vary depending on strain, strain rate jump and direction of loading.



Throughout my life I loved taking things apart and trying to understand how they worked. Before I entered college, I knew that engineering is what I wanted to do. I started college at Anne Arundel community college to save money and I am glad I started there as I had great professors that I learned a lot from. I transferred to University of Maryland, Baltimore County (UMBC) after finishing my second year where I graduated spring 2013 with my mechanical engineering degree. Toward my last year of my undergrad, I realized that I wanted to learn more then what was capable at an undergrad level. This is when I decided that I had to continue my education by going to grad school. I started graduate school at UMBC fall 2013, working on my masters in mechanical engineering with my research in solid mechanics and plasticity of magnesium alloys.



Due to an increase awareness of global warming and increase in oil price, light weight material are in a demand. Magnesium alloys are one material that extensive amount of research is needed in understanding its mechanical response especially in the highly sought after sheet and extruded material. Sheet and extruded magnesium alloys show better mechanical properties however show strong basal texture that are developed during manufacturing; the basal plane tends to form parallel to the die surface. As a result, the material has significant anisotropy and asymmetry properties (different material properties in the x, y and z direction and in tension and compression). My research is in testing and modeling the mechanical response of the material in sheet magnesium alloy ZEK100. With an interest in plastic deformation of magnesium alloys related to high impact loading to model manufacturing formability and crashworthiness of the material. This type of research is extremely important in the automotive industry where sheet material will be useful.


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