Visible notch

Secondly, two of the five steel containers found by the Soviets in the above-mentioned side room (cell) were later piled up in Hut 52. The report of the Polish-Soviet Committee alleges that these five containers were of CO. But one of the two containers visible in the side room (cell) today - to the right of the observer - bears the inscription CO2, i.e., carbon dioxide. This is quite visibly notched into the surface of the container.40 It is well known that carbon dioxide is not a toxic gas. 

Weld Line (Visible Notch or Colour Change)... 

Figure 9.17 Visible notch on the top and bottom side of a transparent part...

Improving a weld line (visible notch or colour change)... 

Hence our analysis and prediction, selected Tor logical clarity, reverse the actual chronology. Our prediction of the visible spectrum from the ultraviolet spectrum is more straightforward than was the reverse prediction. Notice that the ultraviolet spectrum utilizes all of the notches involved in producing the visible spectrum. In contrast, none of the visible frequencies involves notch 1, the key to the ultraviolet spectrum. 

The charge-coupled device was first used in Raman spectroscopic applications in the late 1980s [45, 46], followed rapidly by the introduction of holographic notch filters [47]. This combination, coupled with the visibility of FT-Raman instruments introduced at around the same time, helped drive the growth of Raman outside the academic lab. Although the throughput advantage of... 

The size of the plastic zone parallel to the load direction, L(, shows a different behaviour in the considered networks. The plastic zone is well visible in thin films ( 200 nra), in contrast to thick samples. In thin films, the size L( of the zone is equal to the film thickness. This result is in contrast to linear polymeric glasses, where L is usually larger than the sample thickness. In networks, L ( does not depend on the length of the notch. However, such a correlation is valid for linear polymers. 

Post-failure studies of the fracture surface morphology of bulk semi-crystalline polymers are more difficult than those of amorphous materials due to the more complex multiphase structure associated with semi-crystalline materials However, it was shown that some fractographic details point to the formation of a stress whitened region ahead of a notch prior to final fracture of the material. In particular, stress-whitened regions were easily visible in semi-crystalline polymers such as LDPE and HDPE The resulting, macroscopically apparently brittle fracture... 

In presence of nodules, ultimate properties in tension for non-notched samples remain unchanged. The only visible effect is a decrease in young modulus, E, and yield stress due to the rubber content. In example, young modulus of blends, E, obeys Kemer model [1IJ ... 

This is not true for the angle ply laminates here the fibre direction can have a striking effect. This is most apparent when (p=45°. At lOOMPa, with a notch depth of only 2.5mm, the fibres show themselves in a very obvious way, as can be seen in Fig. 5b. The 45° isochromes are visible at all stress levels up to failure, and are still visible when the stress is released. 

The pitch of the helix for compound 42 was found to be approximately 0.2-0.3 xm, thus the material selectively reflects visible light over a wide temperature range. Moreover, the pitch is relatively temperature insensitive thus the material can be used in large area non-absorbing polarizers, or in optical notch filters or reflectors. In addition, in the glassy state the helical macrostructure of the chiral nematic phases is retained, thus similar applications are possible. 

The report of the inquiry [111] criticised the design and fabrication of the alterations made to the original pontoon. The actual cause of the accident was the failure of some tie bars in the detail around the jacking points. The failure was due to brittle fracture which initiated from severe notches such as a small radius curve at the fillet between the spade end and the shank of the tie bar. Weld defects and fatigue cracks were also present in tie bars subsequently recovered from the sea bed. The tie bars had been flame cut to shape and had weld repairs visible to the eye. There had been no post welding heat treatment of the steel. The steel complied with the original specification but tests showed low Charpy V notch impact values. Photo elastic tests indicated a stress concentration factor of 7 at the fillet between the spade end and the shank. The fracture was initiated in the opinion of the inquiry tribunal by the low ambient temperature of around 3°C. 

The EPDM particles were formd either to initiate crazes or to terminate them, depending on the interfacial bonding, the particle size, the concentration, and the interparticle distances. The variation of notched Izod impact strength of PPBC blends with different EPDM concentrations is shown in Fig. 10.16. The fracture surface of a blend with 10 wt% EPDM, as examined under SEM, is shown in Fig. 10.20. The hemispherical embeddings and hoUows (representing the removed EPDM particles) are clearly visible on the fracture surface. The ribbonlike structures visible on the fractured surfaces are probably the micro-shear bands in the blends. 

As to the different behavior in the unnotched and notched experiments, it seems that the layer of pure and ductile PP, visible on the surface of the injection molded specimen, masks the differences in crack propagation seen in the notched experiments and leveling off the effects of fiber concentration. 

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