Experimental results show that the frequency tracking error is less 晅han 0.5Hz in the range from 45Hz to 55Hz, and the notch depth of the filter, i.e. series mode rejection ratio, is 30-40 dB.

The filter utilizes T-type notch filter equivalent circuit consisting of two SAW one-pole resonators plus simple tuning component. The device has a notch depth of 15 dB; -3 dB notch width of 600 kHz with the pass band loss and ripple of (-0.735) dB and 0.5dB respectively.

The influence of notch depth on notched tensile strengthof steel 15MnVN in the normalized,thermal simulated and welded state was investi-gated. The authors present in this paper an expression D for the susceptibility of steelto hydrogen induced cracking,as indicated by the difference in reduction of notchedtensile strength caused by hydrogen i.e.,D=(σ_(NT)-σ_(Impc))/(σ_(NT))100%.

And a-41 dB notch depth is achieved. Transverse feedback system with this notch filter succeeds in curing the instability of the beam. It is proved that the filter can satisfy the requirement of the BEPCII transverse feedback system.

B.for determining K_(ic)of ceramic materials was studied. The results showed that neither the loading velocity nor the notch depth had obvious effecty on K_(ic(?) )and that the notch width had great effect on K_(ic)of ceramic materials.

Then the calculation formula, reflecting the relationship between the fracture toughness K_(IC) (ceramsite reinforced concrete and ordinary concrete) and tensile strength, notch depth, is presented.

and the notch depth and the radius of the bottom arc of the notches have no notable effect on the tensile strength and yield stress of the notch test samples.

The J integral value obtained by the simple estimation method agrees well with that determined by the energy method using multiple medium carbon steel specimens with a circumferential notch, as far as the notch depth is deep or as far as the twist angle is small.

Based on the experiment and finite element analysis of reinforced and plain concrete three-point bending beams with various notch depths, the investigation on fracture behavior is conducted. The effect of steel ratio, kinds of concrete, and notch depth on concrete toughnees K_(IC) as well as on crack tip opening displacement is analyzed.

For circumferentially-notched round specimens, constrained general yielding occurs beyond a critical notch depth.

The corrosion fatigue crack initiation in this case is controlled by the repassivation kinetics of the material and also by a critical notch depth, depending on the applied stress range.

These same analytical tools were also used to predict the influence of specimen notch depth, notch angle, and notch-root radius.

The effects of notch depth and residual stress on fatigue life are determined from the simulation tests.

Minimum stress-concentration factors, produced by multiple elliptical notching of beams, are obtained for wide ranges of notch width, semiminor elliptical axis, notch depth, notch pitch and depth of beam.

J-integral of sheet notched specimen has the simplest form when the notched surface has been taken as the integral contour, i. e.it can be still simplifiedwhereandit can be seen that the ratio of J-integral to radius of curvature P is proportional to the maximum deformation work density W0 at notch root.The specimens were cut from hot rolled sheet of aluminium alloy LY12 with yield strength σ0.2=11.2 kgf/mm2. The specimen sizes are: thickness B = 30mm, width W= 150mm, notch depth a=40mm, and the radiuses...

J-integral of sheet notched specimen has the simplest form when the notched surface has been taken as the integral contour, i. e.it can be still simplifiedwhereandit can be seen that the ratio of J-integral to radius of curvature P is proportional to the maximum deformation work density W0 at notch root.The specimens were cut from hot rolled sheet of aluminium alloy LY12 with yield strength σ0.2=11.2 kgf/mm2. The specimen sizes are: thickness B = 30mm, width W= 150mm, notch depth a=40mm, and the radiuses of notch curvature ρ=20mm and 9mm, respectively. The resistance strain gauges of 1 by 1mm were adhibited on the inner surface of notch at angles θ being 0°, 10°, 20°, 30°, 45°, 60°, 75° and 90°, respectively. And then, the measurement of strain distribution ε(θ) at various load levels was made and deformation work density distribution W(θ) was derived from stress-strain curve. The value A, at last, has been determined by means of numerical integration and the approximation function, and varied in a range of 0.9 to 1.2.Owing to the limitation of the experimental accuracy and the difficulty in determining exact degree of plane strain, the agreement of experimental calibration of J-integral in the present work with J converted from equivalent stress intensity factor Keff considering Weiss's correction of plastic zone can be considered as an approximation for engineering.

The present report summarized the work on the susceptibility to hydrogen embri-ttlement of steel by C.L.M.Cottrol,F.Watkinson and et cetera,utilizing roundnotched tensile test specimens in a chamber filled with high pressure hydrogen.Thespecific type of Implant test specimen as recommended by ⅢW(round specimen,8mmdiam.,40°deg.notch,<0.1mm root radius,0.5mm notch depth)was analyzedand its shortcomings cited.The influence of notch depth on notched tensile strengthof steel 15MnVN in the normalized,thermal...

The present report summarized the work on the susceptibility to hydrogen embri-ttlement of steel by C.L.M.Cottrol,F.Watkinson and et cetera,utilizing roundnotched tensile test specimens in a chamber filled with high pressure hydrogen.Thespecific type of Implant test specimen as recommended by ⅢW(round specimen,8mmdiam.,40°deg.notch,<0.1mm root radius,0.5mm notch depth)was analyzedand its shortcomings cited.The influence of notch depth on notched tensile strengthof steel 15MnVN in the normalized,thermal simulated and welded state was investi-gated.The authors present in this paper an expression D for the susceptibility of steelto hydrogen induced cracking,as indicated by the difference in reduction of notchedtensile strength caused by hydrogen i.e.,D=(σ_(NT)-σ_(Impc))/(σ_(NT))100%.The authorsgive also an example of taking the D value as criterion to compare two differentpostheat procedures and choose the one suitable for making certain welded pressurevessels free from hydrogen induced cracking.

The stationary domain in a planar Gunn device with expanded cross-section ncaranode has been investigated.As the bias voltage increases,the transformation from sta-tionary domain mode to transit domain mode was observed experimentally,and furtherverified by computer simulation.The effects of cross-sectional gradient,doping concen-tration,notch depth,bias voltage and D-E relationship on the formation of stationarydomain arc discussed.It is noticed that the electric field outside the domain reaches itsmaximum...

The stationary domain in a planar Gunn device with expanded cross-section ncaranode has been investigated.As the bias voltage increases,the transformation from sta-tionary domain mode to transit domain mode was observed experimentally,and furtherverified by computer simulation.The effects of cross-sectional gradient,doping concen-tration,notch depth,bias voltage and D-E relationship on the formation of stationarydomain arc discussed.It is noticed that the electric field outside the domain reaches itsmaximum value while the domain is in a quasi-stationary but not real stationary state,and this maximum value plays an important role in determining whether the domain willfinally become stationary or will transform into transit mode.The significance of diffu-sion of electrons to formation of a stationary domain is also discussed.