Showing 5 results for Smart Materials
Volume 1, Issue 2 (9-2020)
Abstract
Smart materials and shells affect on represent the space and identity of a society with their special activity and like any technology and element, it has its own effects and consequences and it can be said that based on the visual attractions and philosophy of the age of communication and visualization the culture of societies founded. The aim of this research is explaination of these effects on urban smart surfaces from psychological and intellectual and cultural anomalies aspects and helping designers to use it logically and in accordance with the culture and smart buildings of the community. The present research has a positive-content aspect and from another aspect, has a normative-content structure. Also, the research method includes descriptive and analytical research along with qualitative strategy, because it addresses contemporary social and cultural conditions. Data collection is based on library studies and documentation. The physical and material effects of smart shells that make urban facades based on perceptual visual cultures in perceptual aspects are criticized: truth and reality, time and space, experience and event, equality and justice, knowledge and information in a society and consider equal the meaning of firmness with persistence, generosity with lavishness, tolerance with indifference, adherence to affection and beauty with pretense and and in sensual aspects: Unity, distance and distance from the world, distorting other senses, undermining the message and meaning of the sender of the message, separation, isolation, apparent attachment, limiting taste, inhumanity of architecture and urbanization would be the results of increasing use of them.
Hamid Basaeri, Mohammad Reza Zakerzadeh, Aghil Yousefi Koma, Seyed Saeid Mohtasebi,
Volume 15, Issue 5 (7-2015)
Abstract
The scope of the current investigation incorporates the entire process involved in design and development of a Shape Memory Alloy (SMA) actuated wing intended to fulfill morphing missions. At the design step, a two Degree-of-Freedom (DOF) mechanism is designed that is appropriate for morphing wing applications. The mechanism is developed in such a way that it can undergo different two DOF, i.e. gull and sweep, so that the wing can have maneuvers that are more efficient. Smart materials commonly are selected as the actuators due to their suitable thermo-mechanical characteristics. Shape Memory Alloy (SMA) actuators are capable of providing more efficient mechanisms in comparison to the conventional actuators due to their large force/stroke generation, smaller size with high capabilities in limited spaces, and lower weight. As SMA wires have nonlinear hysteresis behavior, their modeling should be implemented in a meticulous way. In this work, after proposing a two DOF morphing wing, an aerodynamic analysis of the whole wing for unmorphed and morphed wings is presented. The results show that the performance of the morphed wing in special flight regimes is improved.
Reza Razavilar, Alireza Fathi, Morteza Dardel, Jamal Arghavani Hadi,
Volume 17, Issue 12 (2-2018)
Abstract
In this study a novel solution method for dynamic analysis of clamped-free shape memory alloy beams is presented. It is assumed that the beam is entirely made of shape memory alloy. Based on Euler-Bernoulli beam theory the governing equations of motion and corresponding boundary conditions are derived by using extended Hamilton principle. In the derived PDEs the transformation strain is behaved as external force that changes with time and position. The Galrkin approach is employed to convert PDEs to ODE system equations of motion. The derived equations of motion are solved by using Newmark integration method. The shape memory alloy constitutive model that presented by Souza is applied for specifying the phase of material all over beam. The transformation strain as internal variable that is coupled with states of equations of motion is identified in every time and every position of beam by using return map algorithm. A parametric study on the control variables has been adopted and the results of parametric study are discussed. The results show that the hysteresis damping is increased by increasing the operating temperature. Moreover the damping of system is faster by increasing the initial displacement in free vibration.
M. Moradi, M. Karami Moghadam, F. Asgari,
Volume 20, Issue 4 (4-2020)
Abstract
Additive manufacturing in the modern world is progressing significantly, resulting in special applications in engineering sciences, medicine, and art. When the MIT university mixed the concept of time in the 3D printing process, time was considered as the fourth dimension. By combining the fourth dimension, the time, the smart materials made of additive manufacturing are able to a reaction to the external motivations (heat, voice, impact, etc) within a specified time. In the 4D printing process, the material configuration will be converted to a converter that will be exposed to external motivation such as heat, water, chemicals, electrical current and magnetic energy. It is expected that in the future, this technology will be widely used, requiring the application of various engineering disciplines, including mechanical engineering, in the fabrication and production of objects, because the overall perspective of the 4-D printing process is to make intelligent materials that are optimized using computational challenges and empirical knowledge. In this article, after reviewing the 3D printing and introducing smart materials, the issue of 4D printing has been investigated using this material. The mechanism, challenges, applications, and future of 4D printing has been discussed.
Dorsa Arabمهندسیو علم دانشگاه صنعت ایران، تهران, Hamid Soleimanimehr, Amin Nasrollah,
Volume 22, Issue 10 (10-2022)
Abstract
Ionic polymer-metal composites (IPMC) are such as smart materials which under applied voltage will be deformed and they have a broad application prospect. On the other hand, increase of surface area of this composite is directly related to bonding between electrode and polymer, as a result, polymer surface morphology is highly important, therefore, the effect of micro-blasting on the dynamic response of the composite beam is investigated. In this research, a membrane from ionic–polymer-metal composites are manufactured. Its main core is based on an electroactive core named Nafion and the electrodes are made of metals such as Platinum which is a noble metal. Then a transient voltage applied to the ionic–polymer-metal composite which was 1 volt and the displacements are measured experimentally. Finally, by the effect of micro-blasting as a surface treatment technique on the composite and comparing experimental results, a suitable equation is proposed for the behavior of this actuator under transient voltage.
