This Festschrift marks the retirement of Professor Chris Calladine, FRS after 42 years on the teaching staff of the Department of Engineering, University of Cambridge. It contains a series of papers contributed by his former students, colleagues, and friends. Chris Calladine's research has ranged very widely across the field of struc tural mechanics, with a particular focus on the plastic deformation of solids and structures, and the behaviour of thin-shell structures. His insightful books on Engineering Plasticity and Theory of Shell Structures have been appreciated by many generations of students at Cambridge and elsewhere. His scientific contri bution outside engineering, in molecular structures, is at least as significant, and he is unique among engineers in having co-authored a book on DNA. Also, he has been keenly interested in the research of many students and colleagues, and on many occasions his quick grasp and physical insight have helped a student, and sometimes a colleague, find the nub of the problem without unnecessary effort. Many of the papers contained in this volume gratefully acknowledge this generous contribution. We thank Professor G. M. l. Gladwell for reading through all of the contri butions, Mrs R. Baxter and Mrs o. Constantinides for help in preparing this volume, Godfrey Argent Studio for permission to reproduce Calladine's por trait for the Royal Society, and Dr A. Schouwenburg -from Kluwer- for his assistance. Horace R. Drew Sergio Pellegrino ix CHRIS CALLADINE SOME THOUGHTS ON RESEARCH c. R.

From the reviews:

"The Collection of 37 papers is devoted to the retirement of Professor Chris Callandine, FRS. They can be related to the following topics: Structural Mechanics (19), Shell Structures (9) and Biological Structures (9). the topic is new and very innovative . It can be recommended to graduate students (having basic knowledge in Mathematics, Mechanics, and Material Science), researchers and engineers in structural, mechanical, aerospace engineering, and molecular biology." (Holm Altenbach, ZAMM, Vol. 85 (3), 2005)

Inhalt
Calladine's Contribution.- Some Thoughts on Research.- Publications by C.R. Calladine.- Structural Mechanics.- Collapse Behavior of Expandable Slotted Tubes.- Laws of Evolution of Cracks in Plates in Terms of Stress Resultants.- Nesting Surfaces and Constitutive Laws for the Inelastic Behaviour of Composite Materials.- On the Rotation Capacity of Reinforced Concrete Structural Elements.- The Topology of Cellular Structures.- Symmetry Analysis of the Double Banana and Related Indeterminate Structures.- Large Deflections of a Cantilever.- Rose Windows.- Joining of Metal Matrix Composites.- Utilising Tension in Lightweight Structures.- Elastic Minimum-Weight Design: an Encounter with Alan Turing.- Engineering and Education.- Prediction of Buckling Load from Vibration Measurements.- Non-Collinearly Loaded Laminae.- Linear Matching Methods for Shakedown Analysis.- Analysis of Coiled Piezoelectric Structures.- Frictional Impact in Mechanisms.- Rigidity and Stability of Prestressed Infinitesimal Mechanisms.- Amplitude of Wrinkles in Thin Membranes.- Shell Structures.- On a High-Fidelity Hierarchical Approach to Buckling Load Calculations.- Cat Eardrum Response Mechanics.- Inversion of Metal Cylinders.- Failure Criteria for Shells on Local Brackets.- PCCP Shells.- Pogorelov's Theory of Creases, and Point Loads on Thin Cylindrical Shells.- Shell Buckling and Collapse Analysis for Structural Design.- Bifurcation Buckling of Spherical Sandwich Shells under External Pressure in Plastic Range.- The Prerequisites for an Advanced Design Methodology in Shells Prone to Buckling.- Biological Structures.- Chris Calladine and Biological Structures: A Personal Account.- Calladine's Entry to the World of DNA.- Morphological and Topological Transformation of Liposomes.- ComputationalApproaches to Predicting Sequence-Structure Relationships in DNA.- Understanding Biological Machines Using Household Items: Some Insightful Constructions from the Calladine Workshop.- Measurement of DNA Bend Angles Using DNA Topology.- Structural Insight into the Mechanism of Supercoiling of the Bacterial Flagellar Filament.- Coils and Supercoils in Proteins.- Supercoiling of DNA Molecules.- Author Index.