This volume contains the papers presented at the Fourth International Conference of Thin-Walled Structures (ICTWS4), and contains 110 papers which, collectively, provide a comprehensive state-of-the-art review of the progress made in research, development and manufacture in recent years in thin-walled structures. The presentations at the conference have representation form 35 different countries and their topical areas of interest include Aeroelactic response and structural-acoustic coupling, Aerospace structures, Analysis, design and manufacture, Cold-formed structures, Cyclic loading, Dynamic loading, crushing and energy absorption, Fatigue, fracture and damage tolerance, Plates, stiffened panels and plated structures, Polymer matrix composite members, Sandwich structures, Shell structures, Thin-walled beams and columns and Vibrational response.The range of applications of thin-walled structures has become increasingly diverse with a considerable deployment of thin-walled structural elements and systems being found in a wide range of areas within Aeronautical, Automotive, Civil, Mechanical, Chemical and Offshore Engineering fields. This volume is an extremely useful reference volume for researchers and designers working within a wide range of engineering disciplines towards the design, development and manufacture of efficient thin-walled structural systems.