Background/Objectives: This study evaluates the effects of axial and inclined loading on dental implants modeled with different material properties, thread geometries, and micro-thread configurations to compare their relative effects on stress and deformation behavior in cortical and cancellous bone. Methods: Five implant materials—dentine, titanium, ZrO₂, PEEK, and CFR-PEEK—were analyzed. Each implant model incorporated one of three primary thread designs: buttress, V-thread, or reverse buttress, with and without micro-threads. A three-dimensional finite element model of the implant embedded in cortical and cancellous bone was developed and subjected to a 111.8 N load, representing typical human bite force, applied both axially and at an inclination using ANSYS Workbench 2023 R1. Results: Inclined loading generated substantially higher cortical stress and higher deformation in both cortical and cancellous bone compared to axial loading. Among the materials tested, PEEK exhibited the highest cortical stress concentration and the highest deformation, whereas CFR-PEEK produced the smallest stiffness mismatch with bone among the implant materials, giving intermediate peri-implant stress and deformation, particularly when combined with reverse buttress threads. The effect of micro-threads on cortical stress was material-dependent, increasing for the lower-modulus materials and decreasing slightly for titanium and zirconia. Conclusions: Within the assumptions of this model, CFR-PEEK with reverse buttress threads produced intermediate stress and deformation values between the stiff (titanium, zirconia) and compliant (PEEK) materials under the modelled conditions. Any localized stress change associated with micro-threads represents a change in the computed stress field only; any implication for bone adaptation or osseointegration is beyond the scope of this stress-based model. These findings represent comparative design tendencies that require experimental and clinical validation.

Traumatic Brain Injury resulting from the impact of the human skull is one of the leading causes of death worldwide. The knowledge of the biomechanics of such injuries is essential for the effective design of protective headgear. This study investigates the biomechanical responses of a human skull subjected to an impact with a rigid wall. Finite element analyses were performed by impacting various skull locations, and the utility concept approach was introduced to rank skull vulnerability. Time history plots of the velocity, acceleration and energy were extracted to determine the dynamic responses of the skull. The nasal bone is the weakest and exhibits the lowest stiffness among all skull bones, and transmits a lower level of the impact force to the brain. Parietal bone experiences the greatest deceleration, resulting in higher force transmission to the brain. The frontal bone is found to be the strongest and stiffest bone of the Human skull. The impact on the zygomatic bone also makes the temporal bone vulnerable, emphasising the need for protection of both bones in sagittal skull impacts. These findings provide critical biomechanical insights for optimising protective head equipment tailored to regional vulnerability.

Electric vehicle battery enclosure systems under vibrational loading may experience structural damage, reducing the lifespan of lithium-ion cells. Honeycomb sandwich structures are widely used in EV battery systems due to their high stiffness-to-weight ratio and superior vibration performance. The present study is undertaken to investigate the dynamic behaviour of honeycomb sandwich panels using ANSYS Workbench. A three-dimensional model of a sandwich structure consisting of an aluminium core and composite face sheets is developed in ANSYS. Modal analysis and power spectral density-based random vibration analysis are performed to examine the impact of face-sheet thickness (0.5–2.5 mm) and layup configuration on structural performance. The modal analysis reveals that the natural frequencies increase considerably with thickness up to 1.5 mm due to increased bending stiffness. The results of random vibration analysis demonstrate a substantial reduction in total deformation and equivalent stress with increasing thickness. Among the configurations studied, the [0C/0G]/Core/[0G/0C] layup demonstrates the most favourable response under the present PSD loading condition due to fibre alignment with the principal loading direction. The findings are further converted into practical design guidelines for electric vehicle battery enclosures, including an appropriate face-sheet thickness range of 1.0–1.5 mm and fibre orientations aligned with the principal loading direction, while considering the associated mass penalty. These findings provide a design-oriented framework for selecting thickness and layup configuration to achieve a practical balance between vibration resistance and weight.