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A Handy Testing Machine

A Handy Testing Machine August , 1935 AIRCRAFT ENGINEERIN G 205 Th e Hounsfield Tensometer Provides a Suitable Apparatu s for Routine and Bulk Testing HER E is no doub t tha t with the modern high-grade materials in use in aero­ plane construction, mechanical testing has become of th e greates t importance. It will b e remembered that a series of articles entitled " The Testin g of Metallic Materials " by Mr. E . Skerry, which dealt exhaustively with all aspects of this subject, was published in AIR­ CRAFT ENGINEERING, Vol. VI, March, April, and May, 1934, pp . 77-85, 111-114, an d 139-140. I n those articles all the recognised standard tests for metals were detailed, and th e principal types of machine available described. The drawback of many of these standard types of test is that they require large and expensive machines, and careful preparation of specimens of considerable size. They are essentially part of a test laboratory equipment which all firms do not possess. Furthermore, they are no t all suitable for th e routine testing All the standar d forms of tests can be applied for mersurement by piston K displacing of small pieces which is valuable in the work­ in the Tensometer. It is capable of obtaining mercury along a thermometer tube M (at atmo ­ shop. th e Yield Point, Maximum Stress, Elongation ; spheric pressure) mounted on graduated scales A machine to meet this need has been Poin t of Fracture, Reduction in Area, and seen in the end view. This mercury column evolved in the Hounsfield "Tensometer" Brinell Hardness Number and it can be used is adjusted to zero before each test by the handled by Tensometers, Ltd., of 73 South­ for applying the Notched Bar, Bend and Strip screw N. ampto n Row, London, W.C.1. The Tensometer Tests. Attached to the machine is an Auto­ For tests of Brinell hardness, the specimen is no t t o be considered as a n alternative to th e graphic Recorder which automatically provides is held against the ball O by advancing the larger and more elaborate types of apparatus a graph of th e results of the test and enables screw P and then locking this by th e to p screw. which are needed for th e tests at present called th e user rapidly and accurately to plot the The inner screw then applies the appropriate for in B.S. Specifications. It provides an easy stress curve of a sample while it is being pressure, as shown by the mercury column, method of making additional tests over and broken. through the plunge r which can slide, bu t cannot above those called for, which are often of great Th e operation of th e machin e is as follows:— turn , in th e locked outer screw P. value when, for example, it is desired to check When being used for a tensile test, the test- The drum of the autographic recorder is th e uniformity of a batch of material or over piece is held in th e half-chucks B and C, th e turned by a cord attached to the lever th e whole of a bar or sheet. Another feature two halves of each pair being held together by so that one turn of the handle advances of the Tensometer is tha t only a small piece is a ring D (Fig. 2). Turning a handle on the th e paper 2 mm . On the horizontal scale of necessary for testing purposes and such a square end of th e screw turns lever E clockwise, th e mercury column slides a cursor, which is sample can often be obtaine d from a par t which pulling towards the right, through the test caused to follow the mercury column by the ha s failed or shown a defect in service where piece, the discs HH (joined by J) which abut operator's left hand as his righ t hand turns th e circumstances preclude the possibility of on the centr e of spring beam F. The deflection handle. This cursor is linked t o a n ar m carrying securing a " full-size " test piece. of F is proportiona l to th e load and is magnified a needle, which is guided over the top of the drum and mounted so as to prick the paper when depressed (preferably by the right hand) after, and not before, the material has complete­ ly responded to an increase of load as shown by the mercury first rising and then ceasing to fall back. The machine, as supplied, com­ prises a Brinell apparatus with microscope and Brinell table with the autographic recorder. The equipment provided with it includes two sets of chucks suited t o holding four different sizes of test piece ; a universal gauge for measuring elongation an d a similar gauge for measuring percentage reduction in area ; notched-bar test apparatus and jig an d cutter. The complete machine only weighs 35 lb., and is therefore readily transportable to any convenient place in th e workshop . It is con­ tained in a mahogany case. The price with equipment as supplied is £66. The bend-test and strip- tes t apparatus, two further sets of chucks, and a planimeter for measuring the are a of th e notched- ba r test record can be supplied as extras. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Aircraft Engineering and Aerospace Technology Emerald Publishing

A Handy Testing Machine

Aircraft Engineering and Aerospace Technology , Volume 7 (8): 1 – Aug 1, 1935

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Publisher
Emerald Publishing
Copyright
Copyright © Emerald Group Publishing Limited
ISSN
0002-2667
DOI
10.1108/eb029959
Publisher site
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Abstract

August , 1935 AIRCRAFT ENGINEERIN G 205 Th e Hounsfield Tensometer Provides a Suitable Apparatu s for Routine and Bulk Testing HER E is no doub t tha t with the modern high-grade materials in use in aero­ plane construction, mechanical testing has become of th e greates t importance. It will b e remembered that a series of articles entitled " The Testin g of Metallic Materials " by Mr. E . Skerry, which dealt exhaustively with all aspects of this subject, was published in AIR­ CRAFT ENGINEERING, Vol. VI, March, April, and May, 1934, pp . 77-85, 111-114, an d 139-140. I n those articles all the recognised standard tests for metals were detailed, and th e principal types of machine available described. The drawback of many of these standard types of test is that they require large and expensive machines, and careful preparation of specimens of considerable size. They are essentially part of a test laboratory equipment which all firms do not possess. Furthermore, they are no t all suitable for th e routine testing All the standar d forms of tests can be applied for mersurement by piston K displacing of small pieces which is valuable in the work­ in the Tensometer. It is capable of obtaining mercury along a thermometer tube M (at atmo ­ shop. th e Yield Point, Maximum Stress, Elongation ; spheric pressure) mounted on graduated scales A machine to meet this need has been Poin t of Fracture, Reduction in Area, and seen in the end view. This mercury column evolved in the Hounsfield "Tensometer" Brinell Hardness Number and it can be used is adjusted to zero before each test by the handled by Tensometers, Ltd., of 73 South­ for applying the Notched Bar, Bend and Strip screw N. ampto n Row, London, W.C.1. The Tensometer Tests. Attached to the machine is an Auto­ For tests of Brinell hardness, the specimen is no t t o be considered as a n alternative to th e graphic Recorder which automatically provides is held against the ball O by advancing the larger and more elaborate types of apparatus a graph of th e results of the test and enables screw P and then locking this by th e to p screw. which are needed for th e tests at present called th e user rapidly and accurately to plot the The inner screw then applies the appropriate for in B.S. Specifications. It provides an easy stress curve of a sample while it is being pressure, as shown by the mercury column, method of making additional tests over and broken. through the plunge r which can slide, bu t cannot above those called for, which are often of great Th e operation of th e machin e is as follows:— turn , in th e locked outer screw P. value when, for example, it is desired to check When being used for a tensile test, the test- The drum of the autographic recorder is th e uniformity of a batch of material or over piece is held in th e half-chucks B and C, th e turned by a cord attached to the lever th e whole of a bar or sheet. Another feature two halves of each pair being held together by so that one turn of the handle advances of the Tensometer is tha t only a small piece is a ring D (Fig. 2). Turning a handle on the th e paper 2 mm . On the horizontal scale of necessary for testing purposes and such a square end of th e screw turns lever E clockwise, th e mercury column slides a cursor, which is sample can often be obtaine d from a par t which pulling towards the right, through the test caused to follow the mercury column by the ha s failed or shown a defect in service where piece, the discs HH (joined by J) which abut operator's left hand as his righ t hand turns th e circumstances preclude the possibility of on the centr e of spring beam F. The deflection handle. This cursor is linked t o a n ar m carrying securing a " full-size " test piece. of F is proportiona l to th e load and is magnified a needle, which is guided over the top of the drum and mounted so as to prick the paper when depressed (preferably by the right hand) after, and not before, the material has complete­ ly responded to an increase of load as shown by the mercury first rising and then ceasing to fall back. The machine, as supplied, com­ prises a Brinell apparatus with microscope and Brinell table with the autographic recorder. The equipment provided with it includes two sets of chucks suited t o holding four different sizes of test piece ; a universal gauge for measuring elongation an d a similar gauge for measuring percentage reduction in area ; notched-bar test apparatus and jig an d cutter. The complete machine only weighs 35 lb., and is therefore readily transportable to any convenient place in th e workshop . It is con­ tained in a mahogany case. The price with equipment as supplied is £66. The bend-test and strip- tes t apparatus, two further sets of chucks, and a planimeter for measuring the are a of th e notched- ba r test record can be supplied as extras.

Journal

Aircraft Engineering and Aerospace TechnologyEmerald Publishing

Published: Aug 1, 1935

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