Bending Research Papers - Academia.edu (original) (raw)

A new roll-based process and machine for three-dimensional bending of profiles with symmetrical and asymmetrical cross-sections have been developed. Compared to conventional processes like stretch bending, the advantage of the Torque... more

A new roll-based process and machine for three-dimensional bending of profiles with symmetrical and asymmetrical cross-sections have been developed. Compared to conventional processes like stretch bending, the advantage of the Torque Superposed Spatial (TSS) bending is the kinematic adjustment of the bending contour, leading to higher flexibility and cost efficiency, especially in small batch production. To define the spatial geometry

Collapse of pile-supported structures in liquefiable deposits is still observed after strong earthquakes despite the fact that large factors of safety (against bending due to lateral loads and axial capacity) are employed in their design.... more

Collapse of pile-supported structures in liquefiable deposits is still observed after strong earthquakes despite the fact that large factors of safety (against bending due to lateral loads and axial capacity) are employed in their design. Currently, piles in liquefiable soils are designed as beams to avoid bending failure arising from lateral inertial and kinematic (lateral spreading) loads. Recent research suggests that part of the pile in liquefiable soils needs to be treated as unsupported structural columns to avoid buckling instability. Essentially, piles should be treated as columns carrying lateral loads. Beam bending and column buckling require different approaches in design. Designing against bending would not automatically suffice for the buckling requirements. To avoid buckling instability, there is a requirement of minimum diameter of the pile depending on the depth to which the pile may be unsupported owing to liquefaction. In addition, there is also a need to reconside...

Designing a multi-robot system provides numerous advantages for many applications such as low cost, multi-tasking and more efficient group work. However, the rigidity of the robots used in industrial and medical applications increases the... more

Designing a multi-robot system provides numerous advantages for many applications such as low cost, multi-tasking and more efficient group work. However, the rigidity of the robots used in industrial and medical applications increases the probability of injury. Therefore, lots of research is done to increase the safety factor for robot-human interaction. As a result, either separation between the human and robot is suggested, or the force shutdown to the robot system is applied. These solutions might be useful for industrial applications, but it is not for medical applications as a direct interaction between the human and the machine is required. To overcome the rigidity problem, a soft robot arm is presented in this paper. Studying the structure and performance of a contraction pneumatic muscle actuator (PMA) is illustrated, then useful strategies are used to implement a multi PMA continuum arm to increase the performance options for such types of the actuator. Moreover, twin arms ...

Using the analytical approaches developed, the cross section of the new fibre composite beam described in the prequels to this paper is designed in order to avert secondary failure modes. A series of specimens have been built and put... more

Using the analytical approaches developed, the cross section of the new fibre composite beam described in the prequels to this paper is designed in order to avert secondary failure modes. A series of specimens have been built and put through a thorough testing regime to establish the performance of the beam. To gain confidence in the analytical models and achieve further understanding of the beam behaviour, a rigorous nonlinear finite element analysis is also presented. It was found that the analytical model agreed relatively well with the experiment and the FE analysis, thus validating the underlying assumptions.

This paper presents a gesture recognition model; known as Digital Vocalizer. Digital Vocalizer is an arduino UNO based system and this system is designed to make the communication gap between dumb, deaf and blind communities and their... more

This paper presents a gesture recognition model; known as Digital Vocalizer. Digital Vocalizer is an arduino UNO
based system and this system is designed to make the communication gap between dumb, deaf and blind communities and their
communication with the normal people as less as possible. Here in this paper, we mentioned the people by normal people who
have the abilities to see, hear and talk. Deaf people make use of the sign languages or gestures to convey what he/she needs to
say; but it is impossible to understand by a person who can hear. So we come on a conclusion to make an easy prototype by
taking some of those gestures and convert them into visual and audio forms. So the communication gap can be reduced as much
as possible. For that we make use of arduino UNO Board as Atmega 328 Controller to interface all of the actuators and sensors.
Sensors are fixed on the palm and fingers. Those sensed values will give the information about the parameters like finger ben
hand position angle; and these are converted into electrical signal and switch to arduino UNO. Arduino UNO takes the actions
according to the gestures.

The standards usually reflect with a certain delay the advances of technology in product manufacturing and the growing requisites of the users. In this paper, national, regional and international standards on steel reinforcing bar are... more

The standards usually reflect with a certain delay the advances of technology in product manufacturing and the growing requisites of the users. In this paper, national, regional and international standards on steel reinforcing bar are analyzed. This is a product for which the standards have a low degree of globalization: the penetration of the corresponding ISO standard is low, and national standards are still dominant. The review includes mechanical properties, bending and re-bending, and chemical analysis; other aspects like traceability, fatigue and adherence are briefly addressed. The aim is to verify trends in the quality constraints that may affect the commercialization and application of rebar. Specifically, the requisites related with seismic behavior and the influence of manufacturing processes (natural hardness, online quenching and tempering, micro-alloying). First, the standards to be analyzed are listed, then each of the researched properties are discussed. Previous papers by the authors on related subjects are used as background [1-3].

We present a combined experimental–numerical study on fracture initiation at the convex surface and its propagation during bending of a class of ferritic–martensitic steel. On the experimental side, so-called free bending experiments are... more

We present a combined experimental–numerical study on fracture initiation at the convex surface and its propagation during bending of a class of ferritic–martensitic steel. On the experimental side, so-called free bending experiments are conducted on DP1000 steel sheets until fracture, realizing optical and scanning electron microscopy analyses on the post mortem specimens for fracture characterization. A blended Mode I – Mode II fracture pattern, which is driven by cavitation at non-metallic inclusions as well as martensitic islands and resultant softening-based intense strain localization, is observed. Phenomena like crack zig-zagging and crack alternation at the bend apex along the bending axis are introduced and discussed. On the numerical side, based on this physical motivation, the process is simulated in 2D plane strain and 3D, using Gurson’s dilatant plasticity model with a recent shear modification, strain-based void nucleation, and coalescence effects. The effect of certain material parameters (initial porosity, damage at coalescence and failure, shear modification term, etc.), plane strain constraint and mesh size on the localization and the fracture behavior are investigated in detail.

During the summer semester 2014, seven " Experimental Structures " were developed at the Chair of Structural Design, Technische Universität München. Over the course of the semester, Sebastian Huth designed a modular installation, " Form... more

During the summer semester 2014, seven " Experimental Structures " were developed at the Chair of Structural Design, Technische Universität München. Over the course of the semester, Sebastian Huth designed a modular installation, " Form Follows Tension " (Fig. 1), which combines the principles of active bending, tensegrity and structural membranes. This " Bending-Activated Tensegrity "-structure was redeveloped for the 2015 IASS SYMPOSIUM CONTEST and built at a large scale of approximately 6 x 6 m. Elastically bent glass fibre-reinforced plastic (GRP) rods were used in combination with PVC membranes and polyester belts to form a pre-stressed and self-stabilizing structure. This paper covers all aspects of the planning process including design, material testing, FEM simulation and method statement:-Prelimenary design and redevelopment for larger scale-Theoretical analysis of the relationship between form, self-stress and scale-Physical tests to validate GRP properties-Structural simulation and iterative form-finding, including multiple building steps using FEM-Modal analysis and improvement of first eigenform-Challenges of assembly and measures of redundancy The insights gained throughout this process are finally evaluated to form a perspective on future research.

Laser bending process has many advantages including high flexibility, production of intricate shapes, precise incremental adjustments etc. The use of Nd:YAG laser for bending thin sheet aluminium is done frequently for various... more

Laser bending process has many advantages including high flexibility, production of intricate shapes, precise incremental adjustments etc. The use of Nd:YAG laser for bending thin sheet aluminium is done frequently for various operations.In this experiment laser process parameters were optimized using Taguchi method. The response parameter governing the laser beam in Aluminium sheet bending were evaluated by measuring of the bending angle. Four input parameters such as laser power, scan speed, pulse diameter and pulse duration were taken into consideration for optimization. Furthermore, 25 combinations of these laser parameters were set and Taguchi methodology is used. The optimum parameter settings are: laser power 2.8J, pulse diameter 2.0mm, pulse duration 0.5ns and scan speed 60%. The optimal result was confirmed with a superior bending angle as 20 0 .