Indian Plywood Industries Research and Training Institute IPIRTI

Tumkur Road, India

Indian Plywood Industries Research and Training Institute IPIRTI

Tumkur Road, India
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Vengala J.,Indian Plywood Industries Research and Training Institute IPIRTI | Van de Lindt J.W.,Colorado State University
Asian Journal of Civil Engineering | Year: 2013

The use of bamboo as a structural construction material is gaining traction primarily because (i) it is a rapidly growing material and thus sustainable, and (ii) it has many positive engineering attributes such as its high strength-to-weight ratio in tension. One area of recent development has been the use of bamboo-based construction in seismically active regions of India. In this paper the seismic behaviour of one type of bamboo-based construction is examined and validated by calibrating a non-linear numerical model to wall panel experimental results, and then performing multi-record incremental dynamic analysis (IDA) on the full system level model. The response was very reasonable due, in part, to the relatively light weight of the bamboo roof system. Most importantly, the damage to the bamboo-mortar walls during testing, and particularly the eventual failure mechanisms, were consistent with modern engineered materials thus confirming that this type of construction is a viable alternative for seismic regions, particular in developing countries.


Rao K.S.,Andhra University | Tilak B.,Andhra University | Rajulu K.Ch.V.,Indian Plywood Industries Research and Training Institute IPIRTI | Swathi A.,Andhra University | And 2 more authors.
AIP Conference Proceedings | Year: 2011

In the course of search for environmental-friendly lead-free relaxor ferroelectrics, (Bi,Na)TiO 3-(NBT) based ceramics show very good physical properties among several lead-free compositions. The NBT composition exhibits a strong ferroelectricity and high Curie temperature, and considered to be a good candidate for lead-free ceramics as a substitute for lead-based materials (e.g., PZT). In the present communication barium substituted NBT, (Na 0.5Bi 0.5) 0.912Ba 0.088TiO 3-0.088BNBT composition has been prepared by conventional solid-state reaction process. The tolerance factor has been estimated and found to be 0.819, indicating the stability of the perovskite structure. The XRD analysis of the material revealed a pure perovskite with tetragonal structure. The average grain size as observed from SEM, was found to be 1.04μm. Detailed studies exhibit a relaxor behaviour with diffuse phase transition. The diffuseness parameter has been established to be 1.97. The dielectric relaxation obeyed the Vogel-Fulcher (V-F) relation. From the V-F plot, the obtained values are T f=305°C, Ea=0.0131eV and ν o=2.95×10 5 Hz, which provide the evidence of relaxor behaviour. The electrical behaviour has been probed through complex impedance spectroscopy. The frequency-dependent conductivity spectra obey the power law in the frequency range of 45Hz-5MHz and temperature range of 35°C-60°C. © 2011 American Institute of Physics.


Rao K.S.,Andhra University | Tilak B.,Andhra University | Rajulu K.Ch.V.,Indian Plywood Industries Research and Training Institute IPIRTI | Swathi A.,Andhra University | Workineh H.,Andhra University
AIP Conference Proceedings | Year: 2011

Recently a new wave of interest has risen on relaxor ferroelectrics with complex perovskite structure due to their wide use in fabrication of multilayer ceramic capacitors, electrostrictive actuators, and electromechanical transducers. The polycrystalline 0.93(Bi 0.5Na 0.5)Ba 0.07Z 0.04T 0.96O 3 (0.07BNBZT) ceramic material, which is in the vicinity of the morphotropic phase boundary (MPB) has been prepared by using high temperature solid state reaction method. The tolerance factor has been estimated and found to be 0.815. XRD analysis revealed a rhombohedral perovskite type structure. SEM micrographs showed highly dense grains with rectangular shape. The average grain size is found to be 1.51μm. Dielectric studies in the material ha indicated relaxor behaviour with diffuse phase transition. High value of ε m>1958 is found at 1kHz, Tm (phase transition temperature) 335°C, The diffuseness parameter was established to be 1.60 revealing the relaxor behaviour. Further, to confirm the relaxor behaviour in the material, Vogel-Fulcher (V-F) relation has been used. Estimated V-F parameters are found to be T f=138°C, E a=0.080eV and ν o=2.32×10 8Hz. Cole-Cole analysis has shown a non-Debye type relaxation in the system. Conductivity studies in the material obeyed the Jonscher's power law in frequency range of (45Hz-5MHz) and temperature range of (35°C-600°C). The electric conduction in the system may be due to hopping/mobility/ transportation of charge carriers. © 2011 American Institute of Physics.


Kalawate A.,Indian Plywood Industries Research and Training Institute IPIRTI | Dethe M.D.,MPKV
Journal of Biopesticides | Year: 2012

In the present study, bioefficacy of spinosad (56.25, 72 and 90 g a.i. ha-1) and emamectin benzoate (5, 6.25 and 12.5 g a.i.ha-1) was studied in comparison to cypermethrin (50 g a.i. ha-1) and self-formulated neem seed extract (5 %). Field experiments were undertaken for two cropping seasons during kharif 2005 and summer 2006. From the study it was found that spinosad afforded moderate control of jassid, whitefly and aphid. However, it was found to be the most effective against BSFB. Although corresponding yield recorded in cypermethrin (check treatment) was higher (16.30 and 21.01 t ha-1) it was not significantly different than that noticed in spinosad and emamectin benzoate.


Nandanwar A.,Indian Plywood Industries Research and Training Institute IPIRTI | Naidu M.V.,Indian Plywood Industries Research and Training Institute IPIRTI | Pandey C.N.,Indian Plywood Industries Research and Training Institute IPIRTI
Wood Material Science and Engineering | Year: 2013

Joints are generally the weakest part of furniture and they are primary cause of failure. To ensure durability and performance of furniture, it is important for a designer to understand the stresses acting on the joints for preparing suitable design and specification of a furniture. Since each type of joint is unique in construction, it is important to know their strength, when subjected to various stresses namely shear, bending, and tensile, by testing the joints. Since there is no established test method for joints, this study was carried out to categorize joints based on their shape, identify the stresses acting over them and develop test methods for testing furniture joints in three modes namely shear, bending, and tension, which are required for designing joints of any furniture and also provide means of comparing strength of different types of joints. Different types of furniture joints were taken for the study and were classified based on their shapes such as L-shaped, T-shaped, straight, and corner joints. Six types of jigs (one type for bending, two types for shear, and three types for tension) were designed and developed for testing the joints, in such a way that any type of joint can be tested in three modes, i.e., bending, shear, and tension using a universal testing machine. The criteria for section of jigs for performing tests on joints, based on their shape and stresses acting on a particular joint, were reported. Tests were carried out using all the six type of jigs to check the suitability of jigs and test methods developed in the study. © 2013 Copyright Taylor and Francis Group, LLC.


Thanigai K.,Indian Plywood Industries Research and Training Institute IPIRTI | Nandanwar A.,Indian Plywood Industries Research and Training Institute IPIRTI | Nath S.K.,Indian Plywood Industries Research and Training Institute IPIRTI | Sujatha D.,Indian Plywood Industries Research and Training Institute IPIRTI
Journal of the Indian Academy of Wood Science | Year: 2011

Investigations were carried out on the effect of weathering on Bamboo Mat Corrugated Sheet (BMCS) to predict its service life. BMCS were exposed to accelerated weathering cycles using Ultra violet weatherometer. In the absence of national/international standards for bamboo based panel products the cycles were designed to suit lignocellulosic composites viz. BMCS. At the end of 10, 25, 50, 75,100,150 and 200 cycles, samples were drawn and tested for load bearing capacity. These results were correlated with the results of samples exposed to natural weathering, collected from the BMCS roofing of bamboo based houses after exposure of 4, 5 and 7 years. The correlation between natural weathering (in years) and accelerated weathering (number of cycles) was drawn. From the results it was observed that load bearing capacity of 4.0 N/mm (which is the minimum required load bearing capacity as per IS: 15476) was exhibited after 350 cycles of accelerated weathering, which is equivalent to 25 years of natural weathering. Hence the life of BMCS can be predicted as 25 years. © Indian Academy of Wood Science 2012.


Uday D.N.,Indian Plywood Industries Research and Training Institute IPIRTI | Sujatha D.,Indian Plywood Industries Research and Training Institute IPIRTI | Pandey C.N.,Indian Plywood Industries Research and Training Institute IPIRTI
Journal of the Indian Academy of Wood Science | Year: 2011

The plywood industries had been utilizing plantation timbers and other lesser known timbers for making plywood because of non-availability of conventional timbers. Melia dubia (malabar neem wood) has been identified as one of the fast growing species that would be suitable for plywood making and a study was carried out for determining its suitability for plywood manufacture. Investigations have shown that type-B surface veneers could be produced by peeling and the veneers could be dried without major degrades. Gluing and bonding properties have been studied and found that the panels made using urea formaldehyde and phenol formaldehyde adhesives meets the requirement of MR and BWR grade plywood as per relevant specification. © Indian Academy of Wood Science 2012.


Nandanwar A.,Indian Plywood Industries Research and Training Institute IPIRTI | Naidu M.V.,Indian Plywood Industries Research and Training Institute IPIRTI | Kiran M.C.,Indian Plywood Industries Research and Training Institute IPIRTI | Pandey C.N.,Indian Plywood Industries Research and Training Institute IPIRTI
Journal of the Indian Academy of Wood Science | Year: 2012

Investigations were carried out to study the effect of span depth ratio (span length:thickness) on bending properties viz, modulus of elasticity (MoE) and modulus of rupture (MoR) of plywood. All the three grades of plywood viz. Boiling water proof (BWP), boiling water resistant (BWR) and moisture resistant (MR) were tested and evaluated for MoR and MoE at different span depth ratios of 10:1, 20:1, 32:1 and 48:1 in along the face grain direction and 10:1, 16:1, 20:1 and 24:1 in across the face grain direction, respectively, to study the variation in results because of change in span depth ratio. The results were generalized for all types of plywood viz. MR, BWR and BWP, irrespective of initial raw materials and processing conditions. The results revealed that the bending properties of plywood are in the same range at span depth ratio of greater or equal to 20, whereas reduction of 5-30 % in the values of bending properties was observed for the plywood tested at span depth ratio of 10 as compared to plywood tested at span depth ratio of 20. © 2012 Indian Academy of Wood Science.

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