Search results

The material properties are shown as below: steel Q345; elastic modulus 2.06×1011 N/m2;Poisson ratio 0.3; mass density 7850 kg/m3.
The material properties are shown as below: concrete of floors is C30; elastic modulus 3.0×1010 N/m2; Poisson ratio 0.2; mass density 2700 kg/m3.
The contribution of different factors to the vertical deformation of core tube is shown in Fig.6.
The contribution of different factors to the vertical deformation of steel frame is shown in Fig.7.
Fig.4 The core tube vertical deformation Fig.5 The steel frame vertical deformation Fig.6 The proportion of various factors Fig.7 The proportion of various factors in the core tube in the steel frame Fig.8 The vertical deformation difference Fig.9 The proportion of various factors Compensating methods Based on the previous analysis, the vertical deformation difference between steel frame and core tube reaches its maximum value 25.20 mm in the middle of the structure, leading to large additional inner force in the structure.

Introduction The shrinkage and creep of the concrete are two important elastic-plasticity mechanical properties related to time, they directly affect the strength and durability of concrete materials.
Influence factors of concrete shrinkage and creep are the composition of concrete materials, the mixture ratio, temperature, humidity, curing conditions surrounding environment, cross-sectional area of members, concrete age, stress and properties.
Where is influence factor of temperature and humidity, , T is surrounding temperature, RH is surrounding relative humidity；is influence factor of specimen shape, , f cu for 28-day cubic compressive strength of concrete (MPa).

When the gross weight of wine is 1kg and truck smoothly runs: Longitudinal force is calculated below: (16) Similarly ,lateral force and vertical force can be acquired as below: (17) (18) After referring to relevant literature [3,4] , the values are given below: μ = 0.4, g = 10N / M, when m = 1kg, it is easy to get the values of forces shown below: Because of the complicated and changeable process of truck running,which will be impacted greatly by weather, temperature, humidity, human factors and etc ,it is necessary to compensate the force values.
Considering factors to greatest extent, here it is recommended to make 10% correction of the above force values (ie, ).
The mechanical properties of the honeycomb paper core is shown in table 1 below: Table 1 Properties of honeycomb paper Performance parameters of the base paper material Quantitative (g/m2) 150 Temperature() 30 Relative Humidity 50% Elastic modulus of the base paper material E(GPa)[6] 0.6398 Poisson's ratio ν [5] 0.28 Theoretically, when the relevant datas are brought into related equations, σ is a function of θ.
During the transportation of wine, the honeycomb paper core is under three-dimensional stress .The Young’s modules in three directions are related to the dimensional parameters of honeycomb paper core, especially the stretching angel, which will greatly affects the stress of honeycomb paper core. 2.

CFRP composites differ from metals in many ways because composite has two phases of materials with drastically distinguished mechanical and thermal properties.
The machining, especially, significantly affects these materials, thus leading to various modes of damages including fiber breakage, matric cracking and fiber pullout [2].
The layered structure of carbon fiber also affected the generation of cutting damages.
In addition, the moving direction of cutting edges is also becoming a key-factor to reduce the generation of cutting damages.
References [1] X.Huang, Fabrication and properties of carbon fibers, Materials, 2(2009)2369-2403

Although intensity and rigidity computation results from traditional materials mechanics computation methods are satisfactory , but not all of the stress concentration factors and their possible consequences are taken into account.
The goal is to find the best structure which brings into play it is highest given properties or close as possible to them.
Optimization design, some of data are considered as parameters, such as control variable x, by means of which one can tune the structure until optimal properties are achieved.
The control variable x may be various and can reflect material properties in the natural structure.
Gong Shuguang, Xie Guilan, Mechanical design based on shape optimization[J], Mechanical Design and research, 2002, 18(5),p.41 [5].

The micro-crack existed in rock and its development under impact load can produce accumulative damage and lead to property deterioration of rock.
From eq.(12), it can be seen that damage evolution under tensile condition will affect the material’s compressive yield strength, while compressive damage will affect the material’s tensile stiffness.
From analysis above, it can be seen that rock mass structure will directly influence propagation and attenuation of stress wave, and its influence extent depends on property of the layer.
[5] He Hongliang and Ahrens TJ: Mechanical Properties of Shock-Damaged Rocks.
Symp on Rock Fragm by Blast[C](1987), p. 412-424 [8] Grady D E and Kipp M E: Mechanisms of Dynamic Fragmentation: Factors Governing Fragment Size [R](1985), SAND-84-2304c [9] Yang Jun and Jin Qian-kun: A New Damage Model for Rock Fragmentation by Blasting Based on Stress Wave Attenuation.

Introduction Because of their excellent combination between their physical and mechanical properties, Al and its alloys are situated in an interesting position as concern their use in several industrial applications.
Additionally, due to a large variety of different arrangements of cations and anions, the physico-chemical properties of ILs can be highly tunable [7].
Figure 1 Photograph of the device used for the deposition Results and Discussion The investigation regards some details on how the chloride rich environment affects the surface and/or sub-surface of the elements, which during deposition comes in contact with the ILs that in turn determines deterioration of such materials during a long time interval.
Diab: Environmental factors affecting the corrosion behaviour of reinforcing steel: I.

Long-term field data and research indicate that the optical surface flaw is one of the important factors which affect the device’s load capacity [1] [2][3].
However, the shortcoming of this approach is obvious: because the subjective factors of human, the size of the flaws can not be quantify detected, the detection rate is slow, the labor costs high and the observers need to be trained.
But the factors such as the observer's experience, testing rate and other facts still limit the application of using visual method to detect flaws on precision optical surface.
This method reduces the standard board of defeats the production requirements, and can increase 15 to 30 times the visual acuity, but the employer saw the virtual image inevitably affected by human factors [16].
Advantage of this approach is the type of the flaws is able to be identified, and the scattering properties of the flaws can be researches in depth.

Based on the analysis of influence of foundation elastic rebound and concrete hardening on the response of elastic foundation beam, the paper thinks it is an important cause that designers ignore the above factors of the construction process, and considering the worst case, and suggests designers should ignore the affection of the lock floor’s deadweight when computing the negative moment.
According to the universal and regular phenomenon of the floor’s cracks of Hollywood type structure, relying on a lock engineering, the authors obtained some useful conclusions by establishing finite element model considered foundation elastic rebound and other influencing factors of the construction on the basic of the general calculating method and further analyzing the reasons for the floor's cracks.
The floor's internal force calculative method of considering the construction process According to the standard methods of design, ship lock floor often cracked in the process of construction including filling the soil, etc, and had the characteristic of regularity, this might matter with not considering some factors of the construction process.
In fact the concrete whose mechanical properties changed constantly from pouring to finally solidifying, the changes were likely to affect the internal force.
(1) Foundation elastic rebound, concrete hardening and other factors during construction process had important influences on the floor’s internal force when calculating and analyzing the floor's internal force of lock.

Finally, improve the winch device design to increase the safety factor.
Somebody designed a device to escape [2], but it’s not universal; another way is to escape by others’ help, its safe factor is better, but always suffered by the using conditions.
Worm and worm-wheel meshing parts of the mechanical properties can be described as the equivalent mesh stiffness and damping, the diagram is shown in Fig.5.
Fundamental frequency of vibration of the largest, followed by high-order harmonic vibration reduction; and vibration decreases with the increase of speed, this is due to transmission error, input and output volatility and the rotor eccentricity and other factors arising from the incentive, the experimental results and power analysis are consistent.
Prototyping to improve and check The quality of assumed target is 100 kg, there is no problem hovering in the air when in test, but the promotion process is effected by various factors such as the rope material, compression status and enhance the process of shaking, impact and other factors, affect the rope and the wheel still exists, it between the partial slip phenomenon.