Abstract: A novel flexible polymer was used for the new generation display panel, which was
prepared by thermal annealing treatments. Atomic force microscope (AFM) and visible
spectroscopy were employed to measure the surface roughness and the optical transparency of the
substrates. Mechanical cycles bending were carried on the flexible substrates in this study. Surface
morphology of the substrates after bending was observed by scanning electron microscope (SEM).
The performances of the OLED device were compared for the samples with and without cycles
Abstract: The reflective photoelastic experimental hybrid method for the fracture mechanics of
orthotropic material was developed in this research. it was verified that the reflective photoelastic
experimental hybrid method was more useful for the static plane problems of fracture mechanics,
for the determination of stress intensity factors and for the separation of stress components at the
vicinity of the crack-tip than the transparent photoelastic experimental hybrid method in orthotropic
Abstract: General structures or machines are firmly connected by bolts so that they have many
contact surfaces. Between these contact surfaces, there is a movement that vibrates with tiny
amplitude, which causes friction, leading to fretting damage. This damage causes a remarkable
reduction in the fatigue strength of the structures sub-materials, leading to remarkable fall-down of
life span of machines and structures. The particle reinforced composites under research in the
aerospace and automobile industries, theoretical analysis and research on fretting fatigue involved
with contact are needed, but there are few domestic studies. Therefore, this study is to identify
cracking damage, its initiation, growth direction and location by considering the strength load and
contact (surface/surface) in particle reinforced composites. So it performed a study on ellipsoidal
particle reinforced composites that have contact force under tensile load. This study performed a
theoretical analysis and a fretting test to identify damage mechanism to industrial structures as well as
aerospace and automobile industries according to expanded coverage of application and development
of the composites.
Abstract: The 290 level cave is situated in Nanfen Surface Mine, Liaoning, China. Nanfen surface
mine is one of the biggest iron ore in Benxi Iron Company. The base line of the pit bottom has
reached 346m level in Nanfen surface mine. The importance of in situ assessment of stability of the
290 level cave for next mining design and construction has been met. Investigation at the Nanfen
Surface Mine has shown that damage exists around 290 level cave and that the damage develops
from the energy imparted to the rock by the excavation method and by redistribution of the in situ
stress field around the 290 level cave. Subsequent near-by excavations, removal of loose material
from the existing cave and pore pressure changes will all influence the development and extent of
rock damage, as does the rock type and its fabric. Based on the engineering characters and rock
mechanics, the main characteristics of stress induced brittle failure of the site are introduced.
Various evaluation and measures are sought to stabilize the over-stressed rock mass. The induced
anisotropic damage process was modeled. The major results from numerical analysis of the cavern
are presented and validated by direct comparison with actual monitoring data. Next, an optimization
study was conducted with the experimentally validated and adjusted mathematical model, measured
with a recorder within such a cave. And the stability of the 290 level cave in Nanfen Surface Mine
was analysis. As a result, the model is expected to be a useful tool for simulation, design, and
optimization of pasteurization tunnels. A suitable support measure was proposed and taken.
Abstract: The recently-developed boundary effect concept and associated asymptotic model are used
to explain the size effect phenomena in fracture of quasi-brittle materials. It is demonstrated that the
size dependence of the fracture toughness and strength of quasi-brittle materials is indeed due to the
influences of specimen boundaries on the failure mode and therefore, on the strength of the specimen.
To verify the boundary effect concept, fracture tests on a high strength concrete reported by Karihaloo
et al are analysed and predicted using the asymptotic model. The results show that the predictions of
the asymptotic boundary effect model agree very well with those experimental results.
Abstract: As the rocks were composed of many minerals, high temperature might lead to the
non-consistent deformation among these components. That was the mechanism of thermal damage.
In the present paper, the thermal damage of rocks was investigated under a much broader
temperature range until minerals phase transition. The experimental techniques of AE and the
internal friction were proven to be the most useful tools to reveal the thermal damage. The affection
of thermal damage to Kaiser Effect of temperature and the coupled effects of thermal and
mechanical damage were also discussed.
Abstract: This paper illustrates some preliminary experimental, numerical and theoretical analysis
results of mixed mode I-III rock cracks under apparent mode III loading. Some edge notched
granite specimens are tested under out-of-plane four-points shearing loading condition, i.e., an
apparent mode III loading condition. A series finite element analysis was conducted to understand
the mechanism of the crack fracture propagation under this loading condition. The stress intensity
factor distributions along the 3-D crack tips are also obtained. All crack fracture propagation
surfaces of the specimens are similar helicoids which radius can be mainly influenced by the
loading patterns, i.e., the action width s. The crack fracture initiates at the midpoint of the crack
front. From the numerical calculation and experimental investigation, it has been revealed that all of
these crack fracture initiations are caused by maxima tensile stress σ1. Based on this stress σ1, a new
fracture criterion of mixed mode I-III is proposed. Its predictions agree well with the experiment
results. This criterion can be applied to practice engineering designs which are related with mixed
mode I-III or pure mode III rock crack fracture problems.
Abstract: This study proposes a procedure of damage inspection for the infrastructure in the
harbor. Because most infrastructures in the harbor are submerged under the water the damage
inspection is very difficult to process. Normally, divers with special scheme of damage inspection
are required and the cost is very expensive. Therefore, a two-stage inspection strategy is proposed.
After the first stage of inspection the more detailed second stage inspection will be requested
dependent on the examination results. In the second stage of inspection particularly, it is focused
on the wharf structures of steel-sheet pile type, where the related items are identified
corresponding to the characteristics of the structural system.
Abstract: The strain in the bulk of material was evaluated using high energy white X-rays from a
synchrotron radiation source of SPring-8 in Japan. An austenitic stainless steel (JIS-SUS304L) was
used for a specimen. The specimen of 5 mm thickness was subjected to the bending. The internal strain
of it could be measured using white X-rays which range of energy from 60 keV to 125 keV. The
measurement of the internal strain with a high accuracy was accomplished using the strain data from
several lattice planes of γ-Fe simultaneously. Furthermore, the measurement error of strain could be
decreased by using the diffracted beam with high energy, high peak count and the similar profile with
the Gaussian distribution. The results showed that the high energy white X-rays is effective for the
internal strain measurement in the depth of the order of millimeter.
Abstract: An experimental study of high pressure water jet peening treatment on SPA-H and SPCC
steel was conducted to study the effects of cavitation impacts of high-speed water on fatigue crack
initiation and propagation of notched specimens. Pull-pull fatigue tests’ condition was 350 MPa
maximum stress amplitude, 0.1 stress ratio and 10Hz frequency, while in-situ observation by SEM
was employed. It was found that fatigue life of water jet peening treated SPA-H specimens has been
obviously elongated by comparison with specimens without this treatment. However, for SPCC
steel specimens, by comparison with those without water jet peening treatment, fatigue life was a
little elongated, almost the same and obviously shortened corresponding to water jet peening
treatment time of 5, 10 and 15 minute, respectively. High pressure water jet caused surface
corrosion for SPCC low carbon steel, while with almost the same carbon content, copper, chromium
and nickel elements increased anti-corrosion properties of SPA-H steel. These resulted in the
different fatigue life of SPA-H and SPCC steel. In-situ observation on the crack tips approved above