Open Access
ARTICLE
Seonho Cho1, Seung-Hyun Ha, Bonyong Koo, Minho Yoon, Seung-Ho Ahn
Structural Longevity, Vol.6, No.3, pp. 109-114, 2011, DOI:10.3970/sl.2011.006.109
Abstract Using an isogeometric approach, a continuum-based shape optimization method is developed for elasticity problems. To obtain efficient and precise
adjoint shape sensitivity, precise normal and curvature information should be taken
into account in shape sensitivity expressions, especially for design-dependent problems. In this approach, the basis functions generated from NURBS are directly used
to construct a geometrically exact model in response and shape sensitivity analyses.
Refinements and design changes are easily implemented within the isogeometric
framework. The isogeometric design sensitivity analysis provides more accurate
sensitivity of complex geometries including higher order terms such as normal and
curvature. Also, it vastly simplifies… More >
Open Access
ARTICLE
Murat Balcı1, Ömer Gündoˇgdu2
Structural Longevity, Vol.6, No.3, pp. 115-126, 2011, DOI:10.3970/sl.2011.006.115
Abstract In this study, some physical properties of an Euler–Bernoulli beam
was tried to be estimated by using the method of inverse vibration problem. The
Euler –Bernoulli beam was first modeled and simulated on the ANSYS program
for different boundary condition to obtain data to be used as experimental input
to the optimization program aroused during the solution of inverse problem. An
numerical model of the Euler-Bernoulli beam with unknown parameters was also
developed using a two-dimensional finite element model. Then, these two models
were embedded into the optimization program to form the objective function to
be minimized using genetic algorithms.… More >
Open Access
ARTICLE
Yishan Pan1, Xiangfeng Lv, Zhonghua Li, Xiaochun Xiao
Structural Longevity, Vol.6, No.3, pp. 127-132, 2011, DOI:10.3970/sl.2011.006.127
Abstract Geometry size has a great influence on energy absorption ability of
closed-cell foam metals. Study on energy absorption ability of closed-cell Si-Al
foam metals considering geometry size by impact experiment method. The results
show that the strain and absorbing energy value are decreasing with the geometry
size increasing, and also lead to the hole wall rupture or whole instability. The best
height-width ratio for cube and cylinder are 1.0–1.5 and 1.0–2.0, respectively. With
the increasing of material diameter, the compressive strength increasing quickly,
but the strain reduces. It is clearly that height-width ratio 1.0 is better for cube and
cylinder. More >
Open Access
ARTICLE
Zhengfa Li1, Weibin Song, Zhengdao Wang
Structural Longevity, Vol.6, No.3, pp. 133-143, 2011, DOI:10.3970/sl.2011.006.133
Abstract By using the high froze/recovery strains of shape memory polymers to
meet the requirements of deployable space structures, the folding behavior of shape
memory tape spring consisting of shape memory polymer and metal spring was analyzed. Firstly, numerical simulations were performed on the buckling modes and
affecting factors under the equal- and opposite-sense bends. The results show that
the folding deformations of such structure in the two cases are completely different. The equal-sense bending leads to the structure buckled abruptly, but gradual
torsion buckling is received in the case of opposite-sense bending. The critical
bending moments have big difference in… More >
Open Access
ARTICLE
Guojian Li1, Qiang Wang1, Yongze Cao1, Jiaojiao Du1, Jicheng He1
Structural Longevity, Vol.6, No.3, pp. 145-154, 2011, DOI:10.3970/sl.2011.006.145
Abstract This paper studies the size-dependent freezing of Co, Co-Ni, and CoCu clusters by using molecular dynamics with a general embedded atom method.
There is size effect occurs in these three types of clusters. The clusters with large
sizes always freeze to form their bulk-like structures. However, the frozen structures for small sizes are generally related to their compositions. The icosahedral
clusters are formed for Co clusters (for ≤3.2 nm diameter) and also for Co-Ni clusters but at a larger size range (for ≤4.08 nm). Upon Co-Cu clusters, decohedral
structure is obtained for small size (for 2.47 nm). The released energy… More >
Open Access
ARTICLE
Lakis A. A.1,2, Toorani M. H.1, Kerboua Y.1, Esmailzadeh M.1, Sabri F.1
Structural Longevity, Vol.6, No.3, pp. 155-185, 2011, DOI:10.3970/sl.2011.006.155
Abstract This paper review focuses mainly on development and application of
a hybrid finite element approach used for linear and geometrically nonlinear vibration analysis of isotropic and anisotropic plates and shells, with and without fluidstructure interaction. Development of a hybrid element for different geometries of
plates and shells is briefly discussed. In addition, studies dealing with particular
dynamic problems such as dynamic stability and flutter of plates and shells coupled to flowing fluids are also discussed. This paper is structured as follows: after
a short introduction on some of the fundamentals of the developed model applied
to vibrations analysis of shells… More >
Login
Register
Submit a Paper