This study used the tensile and fatigue test to find the properties of composite material used to fabricate a prosthetic socket with below knee amputation using an excluding air technique. The composite materials consisted of eight layers of carbon-fiber for first socket and eight layers of perlon for second socket of below knee amputation. This study was conducted on a patient have 45years old of height 164cm and weight95kg were measured, and the results showed that the ultimate stress (Ϭult) and yield stress (Ϭy) for eight layers of perlon was39 MPa and 36 MPa, while for eight layers of carbon-fiber was 135 MPa and 121 MPa. The fatigue limit for eight layers of perlon was 15 MPa and for eight layers of carbon-fiber was 90 MPa. The value of pressure on the internal wall of the prosthetic socket was measured by F-socket sensor between stump and socket for four position; this data is anterior =210kPa, lateral=313kPa, posterior=225kPa and medial=180kPa. From mechanical properties and ANSYS workbench 14.5software, the safety factor for below knee socket with eight layers of carbon-fiber is (1.35) which is acceptable for socket design. The safety factor for below knee socket with eight layers of perlon is (0.22) which is failure.

The 2024AA has good mechanical properties and used for many application, there was many research in the field of friction stir welding in past 20 years age, now many research focusing in the friction stir processing technology which has many advantage according to the mechanical properties investigation, in this paper comparing the 2024AA base metal with friction stir process 2024AA with different feed rate and rotation speed, the feed rate that has been used is (20, 35, 50 mm/min), although in the rotation speed (1400, 2000 rpm) where used. The mechanical properties has been investigate, the hardness has been tested in different location. The tensile strength in 2024AA has been found 460 MPa, as comparing with 35, 1400 friction stir processing the ultimate tensile stress found to be 420 MPa so that percentage of improving 9.5 %. The flexural stress in 2024AA has been found 828 MPa as comparing with 35, 1400 friction stir processing the flexural stress found to be 745 MPa so that percentage of improving 11.1 %.

The main objects of this paper are to deal with the new technology of metal sheet forming using the incremental single-point tool to form the sheet metal. However, due to the needed long time to form the metal in incremental so that we used punching and then incremental forming to geometry the final shape of the product. By measuring the thickness and longitudinal strain and evaluating the hoop strain, it was noticed that the less depth in punching with less step size in incremental forming have a better strain effect in metal sheet forming. Keywords: Single point, incremental forming, Strain analysis, step size.

High temperature and pressure conditions lead to expanding the pipelines used to transport different types of fluids. A compressive axial force arises if this expansion is prevented. The present work aims to analyze pipelines’ instability due to internal pressure influence by making a simulation using ANSYS - Mechanical APDL 2019 R3. The study presents comparisons between increasing internal pressure from (0 to 10 MPa) on some pipe parameters like a natural frequency and instability for two pined-pined pipe thicknesses, which are 0.5 and 1 mm. It is concluded that the increase in internal pressure will decrease the natural frequency and stability of the vibrated system but will increase the modal damping ratio and total deformation of the tested pipe.

The optimal combination of aluminum quality, sufficient strength, high stress to weight ratio and clean finish make it a good choice in driveshafts fabrication. This study has been devoted to experimentally investigate the effect of applying laser shock peening (LSP) on the fatigue performance for 6061-T6 aluminum alloy rotary shafts. Q-switched pulsed Nd:YAG laser was used with operating parameters of 500 mJ and 600 mJ pulse energies, 12 ns pulse duration and 10 Hz pulse repetition rate. The LSP is applied at the waist of the prepared samples for the cyclic fatigue test. The results show that applying 500 mJ pulse energy yields a noticeable effect on enhancing the fatigue strength by increasing the required number of cycles to fracture the sample. In addition, the effect on increasing the pulse energy from 500 mJ to 600 mJ shows a significant effect in term of creating the endurance limit for the samples.