Zafer Eker

Stress engineer with eight years of experience in military aerospace industry.

Worked on aircraft structures preliminary and detail stress analysis and sizing using both hand calculations and finite element methods and compiled static stress reports for certification.

Wide knowledge and frequent implementation of standard stress methods in HSB, Niu, Bruhn and ESDU.

Ability of performing static stress analysis by using MSC Patran/Nastran®, Hypersizer® and hand calculations through ESDU, HSB, Bruhn, Niu methods.
Understanding of airworthiness requirements through CS-23, MIL-DHBK-516C, JSSG 2006.

Methodology writing of metallic rib and spar stress analysis for Hürkuş A/C.

Hand calculation of spars of Hürkuş A/C Elevator component and static stress report writing for certification.

Detailed finite element modelling, evaluation and post processing of results of Hürkuş Rudder component and static stress report writing for certification.

Stress analysis studies of Hürjet wing-box component and attach fittings from conceptual layout to assembly, which covers both metallic wing-box for prototype A/C and hybrid wing-box for serial A/C.

• Employment of panel method through MSC FlightLoads for solution of acting forces on wing.
• Layout investigation through MSC Nastran's gradient based optimization technique.
• Creation of GFEM for different versions of structure and/or load loops, which covers GFEM verification, critical load case selection, internal loads extraction, etc.
• Preliminary stress analysis of metallic wing-box and achievement of PDR phase followed by detail stress analysis including strength, stability, metallic joint checks of plain structural members and those with lightening holes, access doors, etc. Fatigue assessment of parts through target fatigue allowable stresses. Stress analysis of interface elements consisting of wing-box and fuselage, wing-box and control surface connection fittings through hand calculations and detailed FE models and achievement of CDR phase. Part approval for manufacturing.
• Creation of test request documents for sub-scale and full-scale static tests of wing-box. Test studies from loads correlation to strain gauge definitions, and finally correlation of prediction and test data.
• Improved manufacturing processes by identifying areas of high stress concentration and suggesting design changes and supported new product development efforts by analyzing proposed designs for structural viability under various loading scenarios on the way from prototype to serial product.
• Achievement of PDR and CDR phases of hybrid wing-box of serial aircraft and part approval for manufacturing. Detail stress analysis of composite wing-box including strength, stability, damage tolerance, bonded joint and bolted-joint checks.
• Methodology creation for bonded composite structure with core team. Analytical calculation tool development, stress analysis of bonded structure through detailed local FE model. Preparation of coupon level test request for adhesive, and element level test request for bonded composite spar-skin structure.
• Involved in stress analysis methodology development studies of of fiber reinforced structures.
• Provided expert guidance on structural issues throughout the design process, ensuring optimal product quality and performance and led international wing stress team of Hürjet A/C for static stress analysis activities.