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Testing Laboratory Discussion :: Strength of Materials - Section 1 (Q.No.6) «« Strength of Materials - Section 1 Strength of Materials - Section 2 Strength of Materials - Section 3 Strength of Materials - Section 4 Strength of Materials - Section 5 Strength of Materials - Section 6 Strength of Materials - Section 7 Strength of Materials - Section 8 Strength of Materials - Section 9 6. A steel bar of 5 mm is heated from 15° C to 40° C and it is free to expand. The bar Will induce [A].no stress [B].shear stress [C].tensile stress [D].compressive stress Answer: Option A Explanation: No answer description available for this question. Workspace

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Workspace Report Lavanya said: (Jan 12, 2013) Stress is not related to the increase in temperature. Kamlesh Patil said: (Feb 1, 2013) Thermal stresses tends to increase the length of body due to thermal expansion. Seenuvasan said: (Feb 1, 2013) Stress depends upon load. There is no load so it cannot have any stress. Ashish said: (Feb 20, 2013) Stress is nothing but the resisting force since due to temperature rise body will expand and if this expansion due to temperature change is restricted then only resisting stress (thermal stress) will come into play since expansion is not restricted that's why no stress is occurring. Nisha said: (Mar 18, 2013) Will come into play since expansion is not restricted that's why no stress is occurring. Rupesh Baroniya said: (Apr 1, 2013) Length of bar increases when we increase the temperature of it due to temperature stress. So this type of stress is always when we heated a metal bar. Sunilkumar said: (Apr 28, 2013) Bar is subjected to free expansion so there is no stress. Noorul said: (Apr 29, 2013) If the bar is being pulled by some load even then its free to expand in the direction of load, no stresses should be produced in this case also right? Sumeet Saha said: (May 1, 2013) If the bar is fixed (rigid) at any one or both side, the a compressive stress will produced. Otherwise in free bar no stress will produced. Dhana Raj said: (Jul 5, 2013) Stress is not related with temperature. So its having no stress. Anusha Madasi said: (Jul 18, 2013) Stress appears when there is an resisting force, since there is no resisting object, material or bar is subjected to free expansion. No stress acts on this bar. Ganesh Pise said: (Aug 9, 2013) Stress is not related to temperature. It related to resisting force per unit area. So, free expansion of bar no stress is induced. Pradeep said: (Aug 13, 2013) Stress = load/area. Stress independent of temperature. Raghuram said: (Sep 3, 2013) It is free to expand so no stress will be induced. Dharnesh Chandran said: (Sep 17, 2013) Stress = load/area. It clearly indicates that Stress independent of temperature. Rajiv said: (Sep 25, 2013) Because the body is free to expand so there is not any stress developed in the bar. Chandrakishor Pal said: (Oct 7, 2013) Because bar is free to expand no any resisting force so no stress generate. Mahender said: (Oct 25, 2013) Stress = load/area. It doesn't on the temperature. Nagaraj said: (Oct 25, 2013) Said that it is free to expand, i.e. there is no load. As stress depends upon the load applied, no stress in the body. Manveer said: (Dec 3, 2013) When no load on metal rod then stress and strain curve define is call plastic flow. Sagar Dagale said: (Jan 17, 2014) How stress is not related to temperature? Sagar said: (Jan 19, 2014) This Bar Is The Free to Expand. Hence no Resisting force is there so no stress Developed. Amarajit said: (Jan 24, 2014) Thermal stress depends on E, as young's modulus is not given stress is zero. Sushant said: (Jan 26, 2014) If the free expansion is prevented then thermal stress will produce otherwise not. Pari.Siva said: (Mar 9, 2014) Length is proportional to temperature, But, there is increase the temperature one stage to another stage so in this case affected to thermal stress. Psd said: (Apr 2, 2014) Stress is not related to temperature. Stress is always force per area. Aman Kumar said: (Apr 17, 2014) But the body try to resist the expansion thats why it is also a stress which is known as thermal stress. Vaijinath said: (Apr 20, 2014) Basically stress is internal resistance of a body to applied load unlike pressure (Though both have same unit). Here there is no applied load rather there is no constraint for the bar which means no internal resistance to the deformation therefore the induced (internal force within a body) is zero, correspondingly the stress is zero. Vicky said: (Jun 24, 2014) Body itself tends to restrict the expansion, there must be compressive stress induced. Krish said: (Jul 13, 2014) Stress is independent on temp but depends on load and pressure(force also). Vikas said: (Aug 18, 2014) @Krish: Thermal stress is dependent on temp because: stress=E*alpha*diff. in temp. wr alpha is co-efficient of thermal expansion. Mukh Ram Meena said: (Sep 20, 2014) The bar free for expansion, so there no stress. Anush said: (Oct 12, 2014) Stress is depend upon the area. Peter Ode Eru said: (Oct 12, 2014) Since there is no young modulus in the question, stress cannot be calculated. Thermal stress = young modulus * stain. Or Thermal stress = young modulus*temperature expansion coefficient*temperature difference. Mech Asar said: (Oct 14, 2014) Steel's melting point is very high so there is no need of worry about stress with out any load apply. Udhayaraj said: (Nov 12, 2014) If the bar is free to expand or contract there will be no stress induced in the body. Chetan Sagar said: (Nov 14, 2014) Since it is given that condition is Free to expand so no stress is produce because stress is the resistance to the external force. Shubham Gaikwad said: (Dec 2, 2014) Because free expansion of a bar stress will induce in the bar As = = E = E dt ---- (1). Where, = Stress due to temperature expansion (N/m2, Pa). E =Youngs Modulus (N/m2). = Strain. = Temperature expansion coefficient (m/m°C). dt = Temperature differance(°C). Ali said: (Dec 10, 2014) No stresses at all unless there is a opposing force. Praveen Sj said: (Dec 21, 2014) Stress is not depend on heat. Ullas said: (Feb 11, 2015) While applying tensile load no restrictions are there but still stress induces. Karanjeet Kumar said: (Mar 1, 2015) It is not development stress on a bar because it is not external load act upon bar. Alfred Asis said: (Jun 11, 2015) There is no forces acting on the heated specimen which causes no stress on the bar. Nagul Shareef Shaik said: (Jul 28, 2015) When a body subjected to temperature change & free to expand then there in no induced stresses. If the bar is restricted, then there is stress development. Harish Krishna said: (Aug 4, 2015) No force hence no stress. When temperature has an effect on body thermal stress comes into action. Gowtham said: (Aug 10, 2015) Stress induced due to temperature is temperature stress. Suresh said: (Aug 19, 2015) Strain occurs dude to change in length then the product of young's modulus and strain gives the stress developed in the bar. Is it correct? Govind said: (Sep 1, 2015) There will be no stress as it is a free expansion. Dharmveer Phate said: (Oct 27, 2015) Here temperature is changing there so thermal stress is produced there are no stress produced. Gauri Shankar said: (Oct 27, 2015) A free bar never had any stress. Its a fact. Vinoth said: (Nov 27, 2015) Stress is what, when we apply some load, there will opposing internal resistance offered to material for not to deform, So in this case, there is no load is applied. It just leave as free expansion. Vatsal said: (Jan 9, 2016) There is no restriction in expansion so no stress will generated. Suraj said: (Apr 7, 2016) Only the thermal stress come in the picture. Vikash Mandal said: (Apr 22, 2016) There is no stress develop, because when we heated a metal then it receive the heat energy and the molecules nearer to it produce vibration and transfer the thermal energy to other. This causes the rise in its temperature and as well as increases the intermolecular distances as there is no external forces applied on the metal who the metal resists it, and as we know that stress is restoring force per unit crossectional area so there is no stress developed in the material. Divakar said: (Jun 8, 2016) As there is no obstruction and the bar is free, no stress will be induced. Sudharshan said: (Jun 21, 2016) The body is free to expand so no stress. Ethin said: (Jun 26, 2016) Stress depending on temperature, s = alpha * t * e. But here not constrained so no stress. Hamed said: (Jul 16, 2016) When heating a body tensile stress will be indicated. Stress = thermal coefficient x change in temperature x modulus of elasticity. Rajamugesh said: (Jul 23, 2016) Heat causes the expansion, hence there is no support to restrict the expansion. Therefore no resistance, no stress induction. Tambi Durai said: (Aug 18, 2016) A body subjected heating under free expansion state doesn't produce stress because it is free to expand. Unless something stops or constrains the expansion due to heat, the body dies not produce stress. [email protected] said: (Aug 22, 2016) In Thermal Stresses the stress does not depends on temperature. Karthik G.M said: (Sep 10, 2016) Because of increase in temperature, the resisting force will be less. So there should be no stress is developed. Pankaj Kumar said: (Sep 14, 2016) Because of if anybody is subjected to free expand or contact with the rise in temperature. Then no stresses will cause induced in the body. Jay Sutar said: (Oct 20, 2016) In the bar stresses are not induced up to the bar is freely expand. When any disturbance comes in contact with bar stress is starting to produce. G K said: (Oct 24, 2016) Stress acts against applied restriction. As in this case, there is no restriction against expansion so there will not be any stress in the rod. Puthu said: (Dec 9, 2016) In case temp reduced from 50 to 30, then what will happen? Maria Talib said: (Dec 20, 2016) But stress = load/ area. As a steel bar length increase with temperature and diameter of steel bar reduces and area value is affected which in result change in shear but it is not zero. Puneet said: (Jan 18, 2017) But the rod will expand after heating. Vaibhav B. said: (Jan 24, 2017) Stress is produced only restriction of strain. But there is strain without stress. Bar expand freely so there is only strain in bar and no restriction of strain. So stress must be zero. Kavita said: (Feb 9, 2017) The bar is free to elongate as there is no restriction hence stress induced is zero. Goutam Ghosh said: (Mar 15, 2017) The bar is free to expand, so no stress will be developed. Alsaba said: (Apr 2, 2017) Bar is free to expand and since no other force is applied so stress will be zero. Nagaraju said: (Apr 14, 2017) Stress = force/area. Here force = 0, Stress = 0, Hence no stress. Leela said: (Jun 12, 2017) As there is no constraint to restrict it expansion. As it is free to expand. So no stress is developed. Rajesh said: (Jul 12, 2017) Stress does not produce in the cases where (1) material is free to expand due to temperature (2) water in a free state (3) when the material is on a frictionless surface. Praveen said: (Aug 18, 2017) Bar is free to expand and there is no obstruction so stress in bar is 0. Rajaguru said: (Sep 18, 2017) Deformation occure due to thermal stress. Anil Ranshur said: (Oct 28, 2017) As there is no constraint to restrict it expansion. As it is free to expand. So no stress is developed. Malla Sai Girish said: (Dec 8, 2017) Here strain exits due to change in temperature. We know that stress is proportional to strain. Therefore stress is present. Shijoh said: (Dec 18, 2017) It will be bending stress. Irappa said: (Jan 11, 2018) It will induce thermal stress. Vishal said: (Jan 13, 2018) Stress is induced only when there is obstruction otherwise there will no stresses are induced. Ajey Negi said: (Jan 17, 2018) Thermal stress induced only if constrain is also provided it means it should be fixed from one end when given the heat per temperature. Post your comments here:

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Strength of Materials - Mechanical Engineering Questions and

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