Dynamic Mechanical Analysis part 2 ppt

... the stress by (2. 2) Figure 2. 1 gives a visual interpretation of the results. Despite the forces being equal at 25 0 ft-lb, the stress seen by the sample varies from 25 0 psi to 20 00 psi. If we ... in the material, be it a sheet of plastic or your catching hand. Figure 2. 2 shows how some strains are calculated. 2. 2 APPLYING THE STRESS How the stress is applied can also affect th...

Ngày tải lên: 05/08/2014, 09:19

... hp (electric) 1 kW = 0 .28 ton (HVAC) Temperature 32 F = 491.7 R 32 F = 0°C 32 F = 27 3 .2 K 0°C = 32 F 0°C = 27 3 .2 K NOTES 1. R. Steiner, Physics Today, 17, 62, 1969. 2. C. Macosko, Rheology ... 2. 1 CONVERSION FACTORS Length 1 mil = 0.000 025 4 m 1 thou = 0. 025 4 mm 1 in. = 25 .4 mm 1 ft = 304.8 mm 1 yd = 914.4 mm 1 mi = 1.61 km Area 1 in. 2 = 645 .2 mm...

Ngày tải lên: 05/08/2014, 09:19

... Figure 4.2c, into the in-phase and out-of-phase strains that corresponds to curves like those in Figure 4.2a and 4.2b, respectively. These sum to the curve in 4.2c and are FIGURE 4 .2 Responses. ... 2 + E ≤ 2 ) Complex shear modulus G * = E * /2( 1 + n) Complex viscosity h* = 3G*/ w = h¢ - i h≤ Complex compliance J * = 1/ G * hwn** *()==+GE...

Ngày tải lên: 05/08/2014, 09:19

... hair (parietal region) 0–0 .2 0 .2 1.0 1.0 2. 0 2. 0–3.0 10.8 1.38 2. 19 0.68 Pubic hair 0–0 .2 0 .2 2. 0 2. 0–5.0 25 .2 0.76 0.08 Finger nail (left thumb) 0–0.5 0.5–1.0 1.0–1.5 1.5 2. 0 0.83 0.76 0.38 0.08 Toe ... (1996) Forensic applications of hair analysis. In: Kintz P (ed) Drug Testing in Hair. CRC Press, Boca Raton, pp 21 1 -22 2. 9) Moriya F, Miyaishi S, Ishizu H (19 92) Pre...

Ngày tải lên: 22/01/2014, 00:20

... references. ISBN 0-8493-8688-8 (alk. paper) 1. Polymers Mechanical properties. 2. Polymers—Thermal properties. I. Title. TA455.P58M45 1999 620 .1 ¢ 929 2—dc21 98-53 025 CIP ©1999 CRC Press LLC Preface ... Tests 3.10 Thermomechanical Analysis Notes Chapter 4 Dynamic Testing 4.1 Applying a Dynamic Stress to a Sample ©1999 CRC Press LLC dynamic measurements were an...

Ngày tải lên: 05/08/2014, 09:19

... plotted decay curve as (4 .24 ) L= () + 1 jAAln ()nnj L= () + ln () AA nnj Lª- () () 1 2 AA n 2 n+1 2 n 2 A LDª () = 1 2 WW st pdtan T M = + 2 1 4 1 2 2 p pG L Tntt=- ( ) (/ )2 0n ©1999 CRC Press ... common in fluid samples. G ML N mgr N = Ê Ë Á ˆ ¯ ˜ + Ê Ë Á ˆ ¯ ˜ - Ê Ë ˆ ¯ 4 1 4 12 2 2 2 2 p pT L GMLr¢= ()() 18 22 4 Tp ... only plot dynamic stress vs. dynamic stra...

Ngày tải lên: 05/08/2014, 09:19

... Ed., Applied Science Publisher, Princeton, 19 82, pp. 159 22 7. J. Gillham and J. Enns, TRIP, 2( 12) , 406, 1994. 5. U. Zolzer and H-F. Eicke, Rheologia Acta, 32, 104, 1993. 6. N. McCrum et al., Anelastic ... link to physical properties was not investigated. 24 Johari and colleagues have reported in both mechanical 25 and dielectric studies 26 that both the b and...

Ngày tải lên: 05/08/2014, 09:19

... Rheology, MIT, Cambridge, 1990. R. De le Garza, Measurement of Viscoelastic Properties by Dynamic Mechanical Analysis, Masters thesis, Univer- sity of Texas at Austin, 1994. R. Hagan, Polymer Testing, ... Ithaca, NY, 1953. 5. R. Bird, C. Curtis, R. Armstrong, and O. Hassenger, Dynamics of Polymer Fluids, vol. 1 & 2, 2nd ed., Wiley, New York, 1987. 6. J. D. Ferry, Viscoelastic Proper...

Ngày tải lên: 05/08/2014, 09:19

... MacKay and Halley (Table 6 .2) recently reviewed chemorheology and the more common kinetic models. 22 A fundamental method is the Williams–Lan- del–Ferry (WLF) model, 23 which looks at the ... degree of cure. This has been used and modified extensively. 24 A common empirical model for curing has been proposed by Roller. 25 This method will be discussed in depth, as well...

Ngày tải lên: 05/08/2014, 09:19

... However, as creep is not the same as dynamic tests, sometimes the data are not even similar GN¢== ÆÆ Æ () () ()wwggyg wg g 2 0 1 2 0 1 0 22 Y 1 2= - () =¢ss xy G Y 1 2 07 21 ddt ddt ghwwhh wg () = ¢¢ {} + ¢¢ ¢ () [] = () . YY 11 ddt ... similar to the Cox–Merz rule above and states 24 (7.14) A mirror relation has also been proposed by Gleissele: 25 (7.15) where k is a cons...

Ngày tải lên: 05/08/2014, 09:19