Numerical and experimental analysis of tube hydroforming in a square cross-sectional die

مقدم أطروحة جامعية

Hammud, Sami Abbas

مشرف أطروحة جامعية

Ismail, Azal Rifat

الجامعة

الجامعة التكنولوجية

الكلية

-

القسم الأكاديمي

قسم هندسة الإنتاج و المعادن

دولة الجامعة

العراق

الدرجة العلمية

ماجستير

تاريخ الدرجة العلمية

2012

الملخص الإنجليزي

Tube hydroforming (THF) is a process of forming closed-section, hollow parts with different cross sections by applying an internal hydraulic pressure and additional axial compressive loads to force a tubular blank to conform the shape of a given die cavity.

The first part of this study included tensile test and hydraulic bulge test before and after heat treatment (annealing) of pure copper and aluminum tubes at temperature (450°C, 400°C).the holding time in the furnace was 1 hour and then cooled in the furnace , and the dimensions of tubes used in the experimental work of copper is (L0 =150mm, d0 = 41.275mm, t0 = 1.06mm) and aluminum is (L0 =150mm, d0 = 60mm, t0 = 2) to obtain forming limit diagram and mechanical properties of tube and the values of the bursting pressure and final thickness at bursting for copper tube before and after treatment is (29MPa, 27MPa)،( 0.892mm, 0.621 mm) and for aluminum tube before and after treatment is (19MPa, 16 MPa),( 1.789mm, 1.4872 mm).

Square grid has been printed by screen method with dimensions (5x5 mm) for copper and aluminum tubes before and after heat treatment and with dimensions (2.5x2.5 mm) for tensile samples of copper and aluminum before and after heat treatment.

Strain Measurement accomplished by using image processing technology using MATLAB by measuring the dimensions of the grid printed before and after the deformation and then measure the true strain on tensile samples and tubes used in the tensile test and hydraulic bulge test before and after heat treatment.

The second part used program (ANSYS 11) and depending on the mechanical properties of tensile test to enter the variables necessary to conduct a series of simulation paths for the tubes formed by hydraulic pressure in the square cross-sectional die to study effect the internal pressure and the axial displacement and the coefficient of friction on the thickness distribution, and the radius of curvature of the tube.

The main objective of the this study is to find the best path to form a tube in the square cross-sectional die depending on the hydraulic bulge test and numerical simulation to reduce costs and loss of the time in the experimental work, it was shown that the best path is the second has been accomplished at pressure (20MPa, 8MPa) and axial feeding (4mm) and then pressure (6MPa) in the thickness distribution of the tube and was less thickness in cross section (0.925mm, 1.83mm) and longitudinal section (0.925mm, 1.83mm) of the copper and aluminum tubes after heat treatment.

التخصصات الرئيسية

هندسة المواد والمعادن

الموضوعات

• الهندسة الهيدروليكية
• ميكانيكا الموائع
• المياه
• التوزيع(نظرية اقتصادية)

• APA
• MLA
• AMA

لغة النص

الإنجليزية

نوع البيانات

رسائل جامعية

رقم السجل

BIM-419308