Chapter 1Introduction1
1.1Background and significance1
1.2Overview of research status4
1.2.1Externally pressurized spherical shells4
1.2.2Externally pressurized untypical shells5
1.2.3Externally pressurized domed heads5
1.2.4Shell buckling research approaches6
1.2.5Externally pressurized multisegment shells7
1.3Problems and solution8
1.4Structure of the monograph10
References12
Chapter 2Buckling of deep sea spherical pressure hulls18
2.1Buckling analysis of geometrically perfect and imperfect hulls19
2.1.1Geometry and material19
2.1.2Buckling of geometrically perfect hulls20
2.1.3Buckling of geometrically imperfect hulls23
2.2Effect of yield strength on the buckling of hulls26
2.2.1Perfect geometry analysis27
2.2.2Imperfect geometry analysis28
2.3Experimental methodology of spherical shells34
2.3.1Shell manufacturing and testing34
2.3.2Material properties38
2.4Buckling analysis of spherical shells39
2.4.1Experimental and analytical results 40
2.4.2Comparison between experimental and numerical results42
2.4.3Effect of constitutive models45
2.4.4Effect of geometrical imperfections46
2.5Summary49
References51
Chapter 3Bionic design of eggshape pressure hulls54
3.1Geometric properties of goose eggshells55
3.1.1Size of goose eggshells56
3.1.2Surface area and volume of goose eggshells58
3.1.3Symmetry of goose eggshells59
3.1.4Shape function of goose eggshells61
3.1.5Thickness of goose eggshells62
3.2Load carrying capacities of goose eggshells63
3.2.1Experimental results of goose eggshells67
3.2.2Numerical results of goose eggshells71
3.2.3Comparison between experimental and numerical data73
3.3Configuration and size eggshaped pressure hulls75
3.4Strength, stability, and buoyancy of eggshaped pressure hull77
3.4.1Strength and stability of eggshaped pressure hull77
3.4.2Uniform wall thickness analysis of eggshaped pressure
hulls78
3.4.3Nonuniform wall thickness analysis of eggshaped pressure
hulls80
3.4.4Spherical pressure hulls analysis81
3.5Analytical results of eggshaped and spherical pressure hulls82
3.6Numerical results of eggshaped and spherical pressure hulls85
3.7Evaluation and comparison of main properties for pressure hulls92
3.8Summary93
References95Chapter 4Effect of geometrical parameters on buckling of eggshaped pressure
hulls97
4.1Effect of shape index on buckling of eggshaped pressure hulls98
4.1.1Geometry of eggshaped pressure hulls98
4.1.2Capacity and mass of eggshaped pressure hull100
4.1.3Numerical modeling of eggshaped pressure hulls101
4.1.4Linear buckling of eggshaped pressure hulls102
4.1.5Nonlinear buckling of eggshaped pressure hulls104
4.2Effect of wall thickness on buckling of eggshaped pressure
hulls107
4.2.1Buckling of geometrically perfect eggshaped pressure
hulls107
4.2.2Buckling of geometrically imperfect eggshaped pressure
hulls111
4.2.3Comparison between eggshaped and spherical pressure
hulls113
4.3Buckling experimentation using CNCmachined eggshaped
shells116
4.3.1Experimental buckling of CNCmachined eggshaped
shells116
4.3.2Numerical buckling of CNCmachined eggshaped shells120
4.4Buckling experimentation using rapid prototyping eggshaped
shells 124
4.4.1Experimental buckling of rapid prototyping eggshaped
shells124
4.4.2Numerical buckling of rapid prototyping eggshaped
shells130
4.4.3Effects of imperfection shape and size on buckling of
eggshaped shells133
4.5Summary134
References136
Chapter 5Enhancement of eggshaped pressure hulls using nonuniform wall
thickness139
5.1Design and fabrication of eggshaped pressure hulls140
5.1.1Geometrical design140
5.1.2Sample fabrication141
5.2Measurement and test142
5.2.1Shape scanning of samples142
5.2.2Hydrostatic test of samples144
5.2.3Tensile tests of material147
5.3Experimental analysis of eggshaped pressure hulls148
5.4Numerical analysis of eggshaped pressure hulls150
5.5Summary153
References154
Chapter 6Collapse modes and ultimate strengths of eggshaped shells with
corrosion thinning157
6.1Problem definition158
6.2Numerical analysis of eggshaped shells with corrosion thinning160
6.2.1Collapse mechanism analysis162
6.2.2Ultimate strength analysis163
6.3Experimental analysis of eggshaped shells with corrosion
thinning165
6.3.1Fabrication and measurement of samples166
6.3.2Externally hydrostatic test of samples169
6.3.3Numerical analysis of fabricated eggshaped shells172
6.4Summary174
References175
Chapter 7Buckling of prolate eggshaped domes under external pressure179
7.1Geometrical and physical properties of eggshaped domes180
7.1.1Geometry of eggshaped domes180
7.1.2Capacity and mass of eggshaped domes182
7.2Manufacture, measurement and test of eggshaped domes183
7.2.1Overview of the manufacturing process183
7.2.2Pretest measurements183
7.2.3Collapse tests185
7.2.4Parent material properties186
7.3Experimental analysis of experimental eggshaped domes187
7.4Numerical analysis and verification of manufactured eggshaped
domes187
7.5Buckling of a perfect eggshaped dome190
7.6Summary194
References195
Chapter 8Buckling of multisegment eggshaped pressure hulls197
8.1Geometry of the multisegment eggshaped pressure hull198
8.2Design of rib rings199
8.2.1Analytical prebuckling analysis of the eggshaped pressure
hull200
8.2.2Inner radii of rib rings201
8.3Numerical result and discussions202
8.3.1Prebuckling state203
8.3.2Buckling state205
8.3.3Postbuckling state207
8.3.4Verification of numerical approach211
8.4Summary214
References215
內容試閱：
The deep sea manned submersible plays an important role in oceanic exploration and deepsea research, which demonstrates the frontier and height of ocean science and technology. The pressure hull is an important external pressure vessel and a buoyancy unit of submersible, which provides a safe living and working space for crews and some nonpressure resistingnonwater repellent equipment.
The spherical pressure hull is the most extensively used configuration due to equally distributed stress and deformation. However, it has disadvantages of highly geometrical imperfection sensitivity, irrational hydrodynamics, and inefficient space utilization. In order to overcome these disadvantages, the authors put forward a new geometry, an eggshaped pressure hull, to take place of the spherical pressure hull. In this case, bionics on eggshaped pressure hulls and their buckling properties are proposed in this monograph.
The monograph contains the following seven chapters：
Chapter 1 briefly introduces background, significance, research status, existing problems and corresponding solutions, and structure of the monograph.
Chapter 2 focuses on the buckling of spherical pressure hulls under various geometric and material parameters, along with laboratory scale experimentation.
Chapter 3 is devoted to the bionic design of eggshaped pressure hulls and an equivalent comparison between eggshaped and spherical configurations.
Chapter 4 evaluates the effect of wall thickness and geometrical shape on the linear and nonlinear buckling of pressure hulls, along with experimentation.
Chapter 5 is dedicated to eggshaped pressure hulls with nonuniform wall thickness and the corresponding experimentation.
Chapter 6 concentrated on the collapse modes and ultimate strengths of externally pressurized eggshaped shells with corrosion thinning.
Chapter 7 investigated the buckling of nontypical prolate domes subject to hydrostatic external pressure.
Chapter 8 is devoted to a multisegment eggshaped pressure hull based on the geometric properties of goose eggs.
This monograph is intended for the professional researchers, teachers, and students whose research interest involves the mechanics of pressure vessels in civil, aero, and ocean engineering, as well as the corresponding technological staffs.
The authors would like to express the deep gratitude to Professor Xilu Zhao, Professor Weicheng Cui, associate Professor Fang Wang, Professor Katsuyuki Konishi, Professor Yohichi Kohzuki, Professor Yoshio Fukushima, and associate Professor Alan Hase. Their critical and constructive advice significantly improved the whole research. Also, the authors were obliged to his diligent master students such as Minglu Wang, Xinlong Zuo, Meng Zhang, Yueyang Wang, Zhengdao Hua, Shengqiu Li, Jiawei Tan, and so forth. Their hard works considerably push forward the research process.
This work was supported by the National Natural Science Foundation of China ［grant number 51709132］, the Natural Science Foundation of Jiangsu Province ［grant number BK20150469］, and the Jiangsu Provincial Government Scholarship Programme. Also, the authors would appreciate the experimental support from Shanghai Engineering Research Center of Hadal Science and Technology, Chinese Ship Scientific Research Center, and Jiangsu Provincial Key Laboratory of Advanced Manufacture and Process for Marine Mechanical Equipment.
Zhang Jian
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