Industrial

A new assessment method of new energy in regional sustainable development based on hesitant fuzzy information
The new energy has been an important driving force in region sustainable development. It is a critical issue to evaluate the role of new energy in region sustainable development. Design/methodology/approach: To deal with this issue, this paper proposes a new score function, in which, both mean and variance are considered. Then it introduces the basic operators, such as hesitant fuzzy weighted a...


The influence of wheel grain size on the surface roughness in ELID fine grinding of SiC ceramics
The demand for silicon carbide ceramics has increased significantly in the last decade due to its reliable properties. Sometimes, single side grinding is preferable over surface grinding, because it has the ability to produce flat surfaces. However, the manufacturing cost is still high because of the high tool wear and long machining time. Additionally, most of these grinding processes are foll...
Performance of micro-crystalline ceramic alumina wheels during creep feed grinding nickel-based superalloy
The dramatical reduction of abrasive crystallite size is an efficient way to improve grinding performance of wheels. In the present investigation, the performance of micro-crystalline ceramic alumina wheels in creep feed grinding Inconel 718 is investigated extensively. Grinding forces and temperature were measured and analysed to characterise the grinding process. Surface roughness was used to...


Material removal analysis in the radial-mode abrasive waterjet turning of ceramic materials
An experimental investigation on the radial-mode abrasive waterjet turning (AWJT) of ceramic materials, with particular attention to 96% alumina and 95% zirconia ceramics, is presented and discussed. The results show that similar tendencies exist in the dependence of material removal rate (MRR) on water pressure and abrasive mass flow rate, as well as the dependence of the turning depth on jet ...
A material removal and surface roughness evolution model for loose abrasive polishing of free form surfaces
We report on the development of a simple process model, motivated by a need to predict the evolution of surface roughness and geometrical change over external, three dimensional free form surfaces undergoing a loose abrasive polishing process. To this end, the process model was derived from tribological wear laws and cast in terms of the point sliding velocity and apparent pressure and then ben...


Grinding force characteristics in elliptical ultrasonic assisted grinding (EUAG) of monocrystal sapphire
The characteristics of grinding forces in elliptical ultrasonic assisted grinding (EUAG) of monocrystal sapphire were experimentally investigated. A series of grinding experiments are carried out to reveal the effects of the ultrasonic vibration and the process parameters on the grinding forces and the force ratio Fn/Ft. The obtained grinding forces during EUAG were lowered by 50% and the force...
Effect of fluid concentration using a multi-nozzle on grinding performance
Grinding fluid, apart from controlling temperature produced at the wheel-work contact zone by way of cooling also helps in lubrication which is achieved by reduction of friction at the wheel-workpiece interface. In the present experimental investigation, grinding fluid is delivered into the grinding zone by a multi-nozzle system in order to determine grindability of low alloy steel at different...

Comparative studies on buckling behaviors of T joint and pipe by varying geometric parameters and analysis methods
In this study, buckling behaviors of T joint and pipe are comparatively investigated by varying geometric parameters and analysis methods. The effects of the wall thickness and ellipticity on buckling behavior are taken into account. According to the lowest potential energy principle, the equations of critical pressure and buckling wave number are established on the assumption of elastic buckli...
Dynamic analysis of two-layer composite beams with partial interaction using a higher order beam theory
Kant׳s higher order beam kinematics, which takes into account both the longitudinal and transverse higher order deformation of beam, is applied to the dynamic model of two-layer partial interaction composite beams. To establish and solve the mathematical problem, the finite element for the composites is then formulated using the principle of virtual work. Furthermore, the finite element of Tim...

Numerical prediction of the chip formation process and induced damage during the machining of carbon/epoxy composites
A finite element model has been developed to analyze the chip formation process and subsurface damage when machining the unidirectional CFRP composites (carbon fiber reinforced polymer). The proposed approach is based on combined elastoplastic–damage model taking into account the stiffness degradation of mechanical properties in the material response. The plasticity generated by the fiber–m...
Numerical and experimental analysis of elastic–plastic pure bending and springback of beams of asymmetric cross-sections
We present a procedure for numerical computation of elastic–plastic bending and springback of beams with asymmetric cross-sections. Elastic-nonlinear hardening behavior of the material is assumed and both isotropic and kinematic hardening models are considered. The strains are described as a function of rotation and shift of the neutral axis and the curvature of the beam. Exact geometric expr...

Dynamic stresses in helical springs locally coated with highly-damping material in resonant longitudinal vibration conditions
This paper analyzes the effectiveness of damping resonance vibrations of a spring using a new method of local coatings made of highly-damping material covering its last coils, as well as the influence of these coatings on the maximum values of dynamic stresses and the values of natural vibration frequencies of springs. It is shown that while an elastomeric coating applied on the whole length of...
Numerical simulation of the effects of various stud and hole configurations on friction hydro-pillar processing
This paper focuses on the effects of stud and hole configurations on weld defects in friction hydro-pillar processing (FHPP). Various configurations of the stud and hole are designed and all welds are performed by using a self-developed high-performance platform with the same welding parameters. The experimental results indicate that the defects usually appear at the bottom of the hole, but the...
Exact solutions for an elastic damageable hollow sphere subjected to isotropic mechanical loadings
In this paper, we first recall some available Eshelby-based homogenization schemes applied to microcracked materials. An emphasis is put on models accounting for interacting opened or closed microcracks and their spatial distribution. On the basis of these schemes, we briefly present a class of isotropic damage models. The main part of the study is devoted to the derivation of exact solutions f...
A constitutive model for anisotropic tubes incorporating the variation of contractile strain ratio with deformation
The contractile strain ratio (CSR) is an important index measuring the anisotropy of tubes. The values of CSR vary non-linearly with the amount of plastic deformation. However, up to now, there are no constitutive models which are able to take this variation into account. In order to obtain the actual deformation characteristics and improve the prediction capability for plastic deformation proc...