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Instrumento para realizar ensayos de estiramiento biaxial

Resumen

Tipo:
Oferta Tecnológica
Referencia:
TOIT20160527002
Publicado:
07/11/2016
Caducidad:
07/11/2017
Resumen:
Un equipo de investigación de una universidad italiana con experiencia en diseño de máquinas y prototipado virtual ofrece un dispositivo para realizar ensayos de estiramiento biaxial en estructuras de metal o tejido de malla con diferentes leyes de cargas/desplazamientos. Dependiendo de las necesidades de medida, el dispositivo aplica diferentes patrones de carga para caracterizar el comportamiento no lineal de la malla, y tiene la capacidad de imponer desplazamientos muy largos (hasta 400 mm). El equipo de investigación busca pymes, industrias, universidades y centros de I+D con el fin de establecer acuerdos de investigación, cooperación técnica o servicio.

Details

Tittle:
Two-axis stretching test instrumentation
Summary:
An Italian university research team with expertise in the field of machine design and virtual prototyping offers a device able to perform two-axis stretching tests on compliant structures made of metallic or fabric meshes with different load/displacement laws.
The team is looking for SMEs/industries/universities/R-Y-D institutes to sign a Research or Technical Cooperation Agreement or a Services Agreement.
Description:
An Italian university research team with expertise in the field of machine design and virtual prototyping offers a device able to perform two-axis stretching tests on compliant structures made of different materials (metallic or fabric meshes) with different load/displacement laws.
Due to the increasing interest in smart materials, the role of very compliant knitted meshes is gaining an important attention in many different fields.
A generic mesh is made of several knits, repeated in an ordinate and periodic structure, and each one is composed of a pattern of several yarns. These types of structure are increasingly used in different applications, for example, in the development of sensors and antennas (metallic knitted meshes) or for bandages, surgical devices and biomedical coatings (elastomeric meshes). In all the possible applications, an accurate assessment of the mesh elastic properties is mandatory since they influence the performance of the final product.
Due to the particular knitting pattern, the elastic behaviour is generally nonlinear and orthotropic and the meshes undergo very large displacements with consequent large deformations and rearrangement of all the internal loops. The characterization of these properties is not a simple task and bi-axial test machines are needed, nevertheless in most cases the mechanical properties are assessed through simple mono-axial stretching tests. In addition, the main difficulties in these measurements arise for the low global stiffness associated to very large displacements of the meshes that require specific adjustments on the standard testing equipment, and to the boundary stiffening effects altering the elasticity assessment that may be introduced by the clamping system.
The technology offered can be used for the characterization of the elastic properties of compliant meshes, in particular to assess the force/displacement relationship during stretching along the two main directions of the yarns (warp and weft). According to the measurement´s needs, the testing device is able to apply different load patterns in order to fully characterize the nonlinear behaviour of the mesh, and it has the ability of imposing very large displacements (up to 400 mm). Moreover, it is provided with a specific mesh clamping system and with an image processing system for identifying and excluding boundary effects, with the result of a good load resolution. The technology is ready to be used, and has already been tested on metallic, plastic and fabric meshes.
Currently, the accuracy in load assessment is adequate for most of the applications. The technology offered has already been used in two research projects funded by European Space Agency - ESA, and can be mainly used in aerospace, as well as medicine and textile industry.
The research team is looking for partners in the field of textile, aerospace, smart materials, antenna and smart fabrics. In particular, The team is looking for industries (SMEs or bigger enterprises) to sign a Technical Cooperation Agreement in order to collaborate for the device upgrade, or a Services Agreement with the partner as end users paying for the use of the device.
Moreover, the team is also interested to sign a Research Cooperation Agreement with universities/R-Y-D institutes as end user proposing and commissioning specific tests and for the test plan, with a consequent upgrade and evolution of the offered technology. The team can offer the possibility to use and perform tests on the machine, and its specific technical know-how.

Advantages and Innovations:
Ability to multi-axis test: The specimens can be stretched by applying different load or displacement combinations along the two main directions. The load path can be pre-defined and customized by the user. Different boundary constraints can be taken into account. This is a particular significant property because currently on the market there are only single axis test solutions able to reach very large displacements, while a bi-axial test is strongly needed to understand the behaviour of meshes.

Ability to cope with large displacements: while the solution currently on the market have a very low ability to cope with large displacements, the device is able to reach about 400 mm of displacement.

Specific design for meshes and tissues: clamps currently on the market are rigid, deformation is measured with the displacement of the borders. The device is provided with a clamping system with hooks specifically designed to be suitable to mesh specimen. In addition, an embedded camera with telecentric lens is able to capture the images of the deformed loops, in order to proceed to an automatic image recognition for assessing the shape modifications during stretching identifying the deformation level of the single yarn, excluding boundary distortions.
Stage of Development:
Prototype available for demonstration
IPs:
Exclusive rights

Partner sought

Type and Role of Partner Sought:
Technical cooperation agreement:
Type: SMEs and big industries
Activity: Textile, aerospace, smart materials, antenna, smart fabrics
Role: Device upgrade

Services agreement:
Type: SMEs and big industries
Activity: Textile, aerospace, smart materials, antenna, smart fabrics
Role: End User, pay per use

Research cooperation agreement:
Type: R-Y-D institutes, University
Activity: Textile, aerospace, smart materials, antenna, smart fabrics
Role: Test plan, End-users commissioning specific tests


Client

Type and Size of Client:
University
Already Engaged in Trans-National Cooperation:
Si
Languages Spoken:
English

Keywords

Technology Keywords:
03003 Ingeniería de aparatos