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Abstract

The subject of this article is the analysis of the relationship between G 0/ M DMT and K D, where G 0 is the small strain shear modulus, while M DMT and K D are respectively the constrained modulus and the horizontal stress index determined from DMT tests. This relationship allows to determine a profile with depth of G 0 from standard DMT test results, useful when data from nonseismic DMT investigations are available. The analysis was based on a large amount of data for a wide range of soils of different origins in Poland. The dataset included OC and NC loams, silts, medium sands, silty sands and fine sands. The overconsolidation ratio (OCR) was estimated using data from CPTU and DMT tests. The obtained empirical G 0/ M DMT vs. K D relationships were compared with the correlations established by Marchetti et al. [1] for different soil types. To account for the significant influence of overconsolidation, an original empirical relationship between G 0/�� p and K D, where �� p is the preconsolidation stress, was defined based on data from all investigated fine-grained soils.
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Authors and Affiliations

Zbigniew Młynarek
1
ORCID: ORCID
Jędrzej Wierzbicki
2
ORCID: ORCID
Paola Monaco
3
ORCID: ORCID
Katarzyna Stefaniak
2
ORCID: ORCID

  1. University of Life Sciences, Poznan, Poland
  2. Institute of Geology, Adam Mickiewicz University, Poznan, Poland
  3. University of L’Aquila, L’Aquila, Italy
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Abstract

Celem artykułu jest przedstawienie oryginalnych poglądów Stanisława Lema dotyczących relacji między filozofią a nauką oraz nauką i filozofią. Wybrane uwagi Lema poprzedzone są przybliżeniem światopoglądu pisarza oraz nakreśleniem jego stosunku do nauki. Na uwagi Lema składają się wybrane opinie tego myśliciela dotyczące następującej problematyki: (1) zorientowania scjentycznego cywilizacji Zachodu, (2) filozofii jako propozycji opisu świa-ta, (3) problemu „matematyczności” świata, (4) specyficznej relacji filozofii (epistemologii) do technologii, oraz (5) Lemowskiej interpretacji twierdzeń Kurta Gödla.

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Authors and Affiliations

Łukasz Gomułka
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Abstract

The article presents the effect of rotational and travelling speed and down force on the spindle torque acting on the tool in Friction Stir Processing (FSP) process. The response surface methodology (RSM) was applied to find a dependence combining the spindle torque acting on the tool with the rotational speed, travelling speed and the down force. The linear and quadratic models with interaction between parameters were used. A better fitting was achieved for a quadratic model. The studies have shown that the increase in rotational speed causes a decrease in the torque while the increase in travelling speed and down force causes an increase in the torque. The tests were conducted on casting aluminium alloy AlSi9Mg. Metallography examination has revealed that the application of FSP process results in a decrease in the porosity in the modified material and microstructure refining in the stir zone. The segregation of Si and Fe elements was evident in the parent material, while in the friction stir processed area this distribution was significantly uniform.

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Authors and Affiliations

Marek Stanisław Węglowski
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Abstract

Flank wear of multilayer coated carbide (TiN/TiCN/Al2O3/TiN) insert in dry hard turning is studied. Machining under wet condition is also performed and flank wear is measured. A novel micro-channel is devised in the insert to deliver the cutting fluid directly at the tool-chip interface. Lower levels of cutting parameters yield the minimum flank wear which is significantly affected by cutting speed and feed rate. In comparison to dry and wet machining, insert with micro-channel reduces the flank wear by 48.87% and 3.04% respectively. The tool with micro-channel provides saving of about 87.5% in the consumption of volume of cutting fluid and energy.

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Authors and Affiliations

Suha K. Shihab
Zahid A. Khan
Arshad Noor Siddiquee
Noor Zaman Khan

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