Talk:Strength of materials

message: Materials science differs from this in what way? —Preceding unsigned comment added by Sparky (talk • contribs) 07:50, January 22, 2004 
* (you can sign your dated name by adding four tildas. Oh, by the way, Hi Sparky)
# Materials science is far broader.
# Academically, they are taught as different subjects.
# In the real world, engineers use these disciplines separately; Materials science involves the development or choice of materials for engineering uses, and Strength of materials is applied to the design of mechanical elements. They are sometimes used in parallel and sometimes overlap. For example, a design engineer choosing a material for a specific application. But they are not the same subject. Professionally, material science is a different occupation than Design engineering or Analysis.
Pud 20:52, 7 Sep 2004 (UTC)
thread_title: Materials science

message: Please see the Talk:Tensile strength#Proposed merger page for discussion (if any) Slinky Puppet 18:01, 11 January 2006 (UTC)
replies: text: No support, I am calling off the merger and removing the links.  Georgewilliamherbert 01:29, 22 September 2006 (UTC)
thread_title: Proposed merger

message: I fixed a bunch of stuff that was clearly wrong, and took out some stuff which didn't make sense.  
I removed the part about Hooke's Law, as it doesn't belong in a strength of materials article, and will only confuse readers about the stress-strain relationship.
I also removed the comment about compressive stress that stated a material under compression will decrease in volume.  This is simply wrong and needed to be removed.  Sorry if I stepped on any toes, but I looked this up at work and my head almost exploded when I read it.
--Ryan 17:30, 21 June 2006 (UTC)
replies: text: Most materials will in fact decrease in volume under compression. Look up the article on Poisson's ratio on wikipedia or google "volume strain". In my opinion, Hooke's law should be mentioned, as well as basic structural analysis methods. This article should reflect the topics covered in common ""Strength of materials"" engineering courses and books, which focus on stress-strain relations, beam and truss analysis, continuum mechanics, and material strength terms. Sigmund 11:58, 20 June 2007 (UTC)
replies: text: About Hooke's law i think it should be added as it is mentioned in almost every book written on strength of materials and has a clear distinction to be added here. Kalivd (talk) 15:19, 24 September 2008 (UTC)
replies: text:  I also think that at least a brief mention of Hooke's Law is essential, as it provides the foundation for the theory of elasticity. (Any readers "confused" by it are likely barking up the wrong proverbial tree!). Fortunately, it is amply described and referenced in a number of other closely related articles on elasticity theory, such as solid mechanics, theory of elasticity and deformation (engineering).  -- logger9 (talk) 17:13, 14 April 2009 (UTC)
thread_title:  Fixes and additions 

message: A search for "structural strength" gives no useful results. My context is the use of that term on the hardboard article. Perhaps the term should be explained in this article?
Skarkkai 11:55, 17 June 2007 (UTC)
thread_title:  Structural strength 

message: The article is far too theoretical, so I have added an external link to real case studies of failure. The article itself also needs some cases as well. Any offers? Peterlewis 14:43, 20 June 2007 (UTC)
thread_title: Case studies

message: Some content (for example, some of the bibliographic references) has been merged from mechanics of materials, a list of whose authors might be found here.
69.140.152.55 (talk) 05:46, 27 September 2008 (UTC)
thread_title:  page history 

message: Subject to strength of materials. Basic assumptions 
I. Introduction. 
All modern buildings, machinery, appliances and equipment are 
manufactured or built on pre-designed projects. The project is 
drawing or series of drawings and technical drawings, which sets out all 
dimensions of the elements of structures and details of the machinery necessary 
for their preparation, their materials and also describes the technology. 
Thus, even in the design process must be perfectly defined 
dimensions of the elements and details of equipment and machinery. Obviously 
these rates depend on a number of conditions and circumstances, including by 
properties of the material and the alleged external influences. 
Each structure must have the reliability in operation and 
be economical. Reliability of the structure shall be provided if it 
store strength, stiffness and stability with guaranteed durability. 
Its economy is largely determined by the cost of 
material from the application of less scarce construction materials 
the possibility of drawing up details of the most advanced technologies. 
Reliability and economy are contradictory requirements. 
Strength - this is the ability of the structure to resist 
destruction in its effect on the external forces (loads). 
Stiffness - this element is the ability to resist 
deformations. 
Sustainability - a property of the system to retain their primary 
balance in the external impacts. 
Durability of the structure consists of its ability to 
store the necessary properties for use in the course of earlier 
certain period of time. 
In strength of materials is widely applied methods 
theoretical mechanics and mathematical analysis, using data from 
sections of physics, studying the properties of different materials, and other 
Science. 
Strength of materials is a theoretical-experimental science, because 
it widely used experimental data and theoretical studies. 
First notes about the strength found in the notebooks of Leonardo da Vinci. 
Genesis of the science of strength of materials refers to the XVII 
century and is connected with the work of the famous scholar of that time Galileo 
Galilei. Significant contribution to this development was made by eminent scientists Hook, 
Bernoulli, Saint-Vena, Koshi, lame, Euler and others. In Russia at the end of the XIX and 
beginning of XX century, important research on resistance 
Materials scientists have made Russian Zhuravskiy I. D., U. S. Yasinskiy, 
I. D. Boubnova, S. P. Timoshenko and others. 
II. The main task of the strength of materials. 
The main task of the strength of materials is to 
development of engineering methods for designing and calculating 
typical elements of structures for strength, stiffness and stability 
durability, given simultaneously backing the economy. 
III. Real objects and computational scheme. 
In strength of materials study the question of reliability 
real object begins with the choice of computational scheme. The real object 
released from non-essential features, a computational scheme. 
The choice of computational scheme begins with the adoption of the basic assumptions. 
IV. Main hypotheses. 
Strength of Materials course aims at creating a 
practically acceptable simple ways to calculate the typical elements 
of structures. Need a practical decision of each task 
bring to the numerical result is the reason for engaging in many cases to 
simplifying assumptions. These are assumptions that are justified after 
compare the numerical results with those of experiments. 
1. Hypotheses about the material. 
a) the assumption of continuity of the material. This is an environment 
occupying a constant volume. 
b) the assumption of homogeneity of the material. 
Under the uniformity means uniformity of properties in all 
points of the body. It is experimentally proved that the material has 
heterogeneous, discrete structure. However, when the volume of 
element volume surpasses many of the structural units composing it ( 
atoms, molecules), real bodies can be regarded as homogeneous. 
c) izotropnost hypothesis. 
Continuous medium is considered isotropic, ie have the same 
properties in all directions. This is steel. Are anisotropic 
materials whose properties in different directions are different 
(eg, wood). 
d) deformiruemost hypothesis. 
If the bodies in the theoretical mechanics is regarded as absolutely 
stiff, then in the resistance of the material bodies have the ability 
be deformed, ie to modify their initial size and shape under 
action of external loads. Deformations of the material in each 
section shall be adopted in relation to their small sizes and can not account 
their influence on the mutual disposition of the cargo (ie 
calculations are carried out in undistorted scheme). 
e) the hypothesis of elasticity. 
Elasticity is the property of their bodies to recover 
original shape and size after removal of the load. 
2. Hypotheses about body shape. 
a) the main task of the strength of materials to be decided 
units of beam type. This is a body whose length is significantly greater than 
transverse dimensions. 
b) the hypothesis of plane sections (the Bernoulli hypothesis). Any 
sectional plane perpendicular to the axis of the beam before 
deformation remains plane and perpendicular to the axis of the deformed 
the beam at this location. 
F F 
3. Hypotheses about the forces applied. 
a) distributed over a small area loads are considered 
concentrated. 
F 
b) the principle of Saint-Vena. If you replace a system forces applied in 
area? 1 of the deformable body, with another system forces equivalent to 
and applied it in another area? 2, it will affect the voltages and 
deformations in the area? that contains? 1 and? 2 and whose size is 
around the greater of the two areas. 
c) the hypothesis of local equilibrium. If one body is stationary, then 
each of its part will also be at rest. 
d) the hypothesis of a static action forces. All applications 
forces increase gradually from zero to its final value. 
e) the hypothesis of initial and final state of equilibrium. 
Let the beam under the action of the load is in equilibrium. Because 
displacements are small, it remains in equilibrium. 
F 
? 
f) the principle of superposition. 
The final value of the quantity (voltage, 
deformation, displacement, rotation) as a result of a set of external 
loads can be obtained as the algebraic sum of the values of 
these variables, which correspond to different loads 
that population. 
F 
? 
F 
2 1 
F 
? 
1 
? 
F 
2 
1 
2 
? =? +? 1 2 
g) the principle of hardening. 
Before loading the body has a certain shape and size. 
F 
F 
2 
1 
F 
3 
F 
4 
After etching, there is another body shape and size. 
F 
F 
2 
1 
F 
3 
F 
4 
Perfectly rigid body - consists of particles, distances between 
not change. 
Deformable solid - spaces between the particles are 
change. It is perfectly elastic to a certain degree of loading.  —Preceding unsigned comment added by 77.245.12.217 (talk) 20:11, 8 September 2009 (UTC)
thread_title:  strength of materials. Basic assumptions  

message: I tidied up the first paragraph to improve the grammar and make it a bit more accessible to a general audience. It still needs a bit more work in this regard.
Fbsck (talk) 10:18, 13 December 2010 (UTC)
thread_title:  First paragraph 

message: It is not appropriate to cut and paste material from other sources without clarifying that the material is in the public domain or released under an appropriate license. Material also requires proper attribution. --Nuujinn (talk) 20:34, 23 January 2011 (UTC)
thread_title: Cut and paste of material into the article

message: Currently the article is long on definitions and short on prose. RJFJR (talk) 03:19, 1 March 2012 (UTC)
thread_title:  Things to improve 

message: The article says this
:"The strength of any material relies on three different types of analytical method: strength, stiffness and stability,"
which has two problems. First, it asserts that a material's strength relies on an analytical method. That is a category error: material strength is a property of the physical world, whereas analytical methods are mental concepts created by and for human reasoning. The second problem with the quoted passage is that it asserts that a material's strength relies (in part) on analysis of strength. That is a mereological error reminiscent of Russell's paradox and the corresponding flaw at the heart of naive set theory; at the very least, it's a circular definition.
I'd fix the offending passage myself, but I ain't no mechanical engineer. So I must resort to recruiting some competent third party to kindly set things aright.PaulTanenbaum (talk) 18:25, 27 June 2012 (UTC)
thread_title:  Screwy sentence 

message: I've always been under the impression that Strength of Materials and Solid Mechanics were names that could be used interchangeably. However, Wikipedia has distinct articles on these topics, which do not talk of each other at all, apart from mentioning each other in their respective "See also" sections.
Could someone please add an authentic statement which clarifies the relationship (if any) between these two topics, in at least one of these articles? Yetanotherwriter (talk) 05:27, 11 April 2014 (UTC)
replies: text: I also thought they were different names for the same field (along with Mechanics of Materials and other terms). I propose that Strength of Materials and Solid Mechanics be merged unless someone can clarify the difference between the subjects (preferably a civil engineering expert using cited sources). The ambiguity is frustrating. Jokester251 (talk) 23:38, 23 February 2016 (UTC)
thread_title:  Strength of Materials vs Solid Mechanics?