Description:A) TECHNICAL FIELD OF INVENTION
[001] The present invention generally relates to a structural material and particularly relates to a novel sandwich beam structure for bearing high load variation and easy installation in various structural designs.
B) BACKGROUND OF INVENTION
[002] Beams are most important part of a building structure and serves the purpose of load bearing. Thus, a beam should bear high loads and also should show least possible wear and tear to a load variation which disrupts a structure of the beam. There are three primary kind of beams namely non-metallic sandwich panels, metallic foam composites and metallic composites. A sandwich panel is any structure made of three layers: a low-density core, and a thin skin-layer bonded to each side. Sandwich panels are used in applications where a combination of high structural rigidity and low weight is required. Many conventional building structure the afore-mentioned beam structures for load bearing.
[003] However, availability is limited to non-metallic structures that may not be able to resist or withstand high loads. In case of metallic foam composites, such beam structure costly and cannot be universally for construction purpose as total cost of the building would escalate. Metallic composites may take up high loads, but, are not light in weight, and requires tedious and costly manufacturing processes as these requires to be casted and subsequently machined to the required shape after solidification.
[004] In the view of foregoing, there is a need for a beam structure material which is light in weight, improved load bearing capability, resistance to variation in loads and easily available at less installation cost.
[005] The value additions and above-mentioned shortcomings, disadvantages and problems are addressed herein, as detailed below.
C) OBJECT OF INVENTION
[006] Thus, the primary object of the present invention is to provide a beam structure material which is light in weight, improved load bearing capability, resistance to variation in loads and easily available at less installation cost.
[007] Another object of the present invention is to provide a beam structure made up of natural rubber cored sandwich structure.
[008] Yet another object of the present invention is to provide a beam structure with low deviation in terms of ideal load bearing capability and wearing of the beam structure.
[009] These and other objects and advantages of the embodiments herein will become readily apparent from the following detailed description taken in conjunction with the accompanying drawings.
D) SUMMARY OF INVENTION
[0010] The various embodiments of the present invention provide a sandwich beam for improved varying load bearing capability in a building structure. The sandwich beam comprises an outer face plate, an inner elastic layer and a plurality of adhesive layers. The inner elastic layer is prepared between at least two layers of the outer face plates forming a sandwich structure. The plurality of adhesive layers are provided between two adjacent layer. The outer face plate forms two outer surface of the sandwich beam followed by an adhesive layer and a layer of the inner elastic layer of selective thickness.
[0011] According to one embodiment of the present invention, the outer face plate is preferably primarily made up of Aluminium.
[0012] According to one embodiment of the present invention, the inner elastic layer is preferably made of a natural rubber.
[0013] According to one embodiment of the present invention, the selective thickness is preferably more than individual thickness of the outer face plate.
[0014] According to one embodiment of the present invention, the selective thickness is preferably equal to individual thickness of the outer face plate.
[0015] According to one embodiment of the present invention, a deviation in a stress bearing capability is within the range of 5-9% and preferably 7% for a range of load applied on the sandwich beam.
[0016] These and other aspects of the embodiments herein will be better appreciated and understood when considered in conjunction with the following description and the accompanying drawings. It should be understood, however, that the following
descriptions, while indicating preferred embodiments and numerous specific details thereof, are given by way of illustration and not of limitation. Many changes and modifications may be made within the scope of the embodiments herein without departing from the spirit thereof, and the embodiments herein include all such modifications.
E) BRIEF DESCRIPTION OF DRAWINGS
[0017] The other objects, features and advantages will occur to those skilled in the art from the following description of the preferred embodiment and the accompanying drawings in which:
[0018] FIG. 1 illustrates a side perspective view of a sandwich beam structure, according to one embodiment of the present invention.
[0019] FIG. 2a and 2b illustrates a flexural test over the sandwich beam structure, according to one embodiment of the present invention.
F) DETAILED DESCRIPTION OF DRAWINGS
[0020] In the following detailed description, a reference is made to the accompanying drawings that form a part hereof, and in which the specific embodiments that may be practiced is shown by way of illustration. The embodiments are described in sufficient detail to enable those skilled in the art to practice the embodiments and it is to be understood that the logical, mechanical, electronic and other changes may be made
without departing from the scope of the embodiments. The following detailed description is therefore not to be taken in a limiting sense. [0021] FIG. 1 illustrates a side perspective view of a sandwich beam structure, according to one embodiment of the present invention. With respect to FIG. 1, the sandwich beam 100 comprises an outer face plate 101, an inner elastic layer 102 and a plurality of adhesive layers 103. The inner elastic layer 102 is prepared between at least two layers of the outer face plates 101 forming a sandwich structure. The plurality of adhesive layers 103 are provided between two adjacent layers. The outer face plate 101 forms two outer surface of the sandwich beam followed by an adhesive layer 103 and a layer of the inner elastic layer 102 of selective thickness. The design structure of metal-rubber-metal gives a highly tear resistant structure and also allows to bear heavy loads.
[0022] FIG. 2a and 2b illustrates a flexural test over the sandwich beam structure, according to one embodiment of the present invention. With respect to FIG. 2a and 2b, a comparison of maximum deflection for the NRCSB and a simple rectangular cross-sectioned AA 5083-H112 beam has been calculated using per Eqn 1. The depth and maximum loads for rectangular beams was considered equal to that of depth cases of Natural Rubber Cored Sandwich Beams:
????????????????= ???????????????? ×????348 ×???? ×???? .....……………… (1)
[0023] For validation of the experimental data of beam stress, the following Eqn 2 has been used:
????????=????×???????? ………………….. (2)
Where,
dmax – Maximum beam deflection
Pmax – Maximum force
L – Beam span length
E – Young’s Modulus of beam
I – Moment of Inertia
???????? – Maximum beam stress
M – Bending moment
y – Perpendicular distance from the neutral axis along height of beam cross-section
The total thickness of the sandwich structure, was calculated using Eqn. 3.
???? =???? +2???? +2?? ………………….. (3)
Where,
d – Sandwich panel thickness
c – Core thickness
t – Face/skin thickness
x – Adhesive thickness
[0024] The natural rubber core sandwich beam (NRCSB) structures show better behavioural response considering load capacity and deflection.
[0025] Test performance of the NRCSB sandwich structures, when tested as per the standards, prepared at room temperatures were less costly than the conditioned environment of the test conducted. Also, the experimental stress results were found to be in well agreement with theoretical results, within 7 % deviation. Also, maximum deflection results of NRCSBs were instituted to be very higher when compared to results considering only AA5083-H112 beams with similar thicknesses.
[0026] No significant failure occurred even at maximum loads in each cases during the test, which also indicates a good bonding strength between the adherends and core materials has been achieved.
[0027] This is well observed that the rubber core material of the beam does influence the overall mechanical property of the sandwich structure, and it can accomplish well when compared to other bonded structures in performance as well as economic.
G) ADVANTAGES OF INVENTION
[0028] The present natural rubber core sandwich beam provides an easily to develop structure with enhanced lad bearing performance. The NRSCB has better response to a variable load applied to a building structure as the deviation during a stress applied is always less than 10% thus leading to quake resistance structure.
[0029] The reasons of high demand of adhesively bonded structures compared to other conventional joining methods may be attributed to various advantages viz., i) reduced
weight and cost; ii) reduced number of production parts converting design and simplified manufacturing processes; iii) high adhesive bonding strength; iv) improvement in aerodynamic/hydrodynamic smoothness and visual appearance; v) low corrosion of structures; and vi) improved resistance to fatigue. Adhesively bonded panels find widest applications in automotive and aircraft applications. [0030] It is to be understood that the phraseology or terminology employed herein is for the purpose of description and not of limitation. Therefore, while the embodiments herein have been described in terms of preferred embodiments, those skilled in the art will recognize that the embodiments herein can be practiced with modification within the spirit and scope of the claims presented in the complete specification or non-provisional application.

Claims:1. A sandwich beam for improved varying load bearing capability in a building structure comprising:
an outer face plate;
an inner elastic layer, wherein the inner elastic layer is prepared between at least two layers of the outer face plates forming a sandwich structure; and
a plurality of adhesive layers, wherein the plurality of adhesive layers are provided between two adjacent layer;
wherein, the outer face plate forms two outer surface of the sandwich beam followed by an adhesive layer and a layer of the inner elastic layer of selective thickness.
2. The sandwich beam as claimed in claim 1, wherein the outer face plate is preferably primarily made up of Aluminium.
3. The sandwich beam as claimed in claim 1, wherein the inner elastic layer is preferably made of a natural rubber.
4. The sandwich beam as claimed in claim 1, wherein the selective thickness is preferably more than individual thickness of the outer face plate.
5. The sandwich beam as claimed in claim 1, wherein the selective thickness is preferably equal to individual thickness of the outer face plate.
6. The sandwich beam as claimed in claim 1, wherein a deviation in a stress bearing capability is within the range of 5-9% and preferably 7% for a range of load applied on the sandwich beam.