No Mike, it doesn't go instantly, from an arc to a non arc. Any curve adds a huge amount of stiffness, increasing gradually as the curve increases. It doesn't remain as floppy as a flat plate, right up to a sudden point , until a certain degree of curve is reached, then go instantly from the floppiness of a flat plate to the rigidity of an arc, and stay the same strength from that point on .
No Mike , it doesn't work that way.
No Mike, a sharp impact on one point is not resisted by the whole grillage. A sharp point impact at one point is not resisted by frames several feet away.
This is all obfuscation as usual. Learn some basic beam theory for starters. Materials resist loads in compression tension or shear. If you want to rely on compression you need a column or an arch, and then the failure mode is not the material strength but the resistance to buckling. Metals are as strong in compression as in tension but if the strain increases at a rate faster than the stress your structure fails. That collapse is from a completely different scenario to those which you aware of. Of real concern is that no matter how many people try to educate you, you choose to ignore basic engineering knowledge.
As for holes and punch shear, grillage will yield along with plate without damage providing the shear strength of the collision area exceeds the structural yield strength of the structure. That's very basic naval architecture and a design requirement for some vessels.
You harp on about holes but you have never given examples except a ship and one of your design that sheared it’s plate rotating it’s keels into the hull.
If span is not the distance between supports, then how would you define span?
Where are going with this ? I said the span of the small section unsupported longitudinals is too great for them to be effective structurally(other than as local plate stiffeners). What don’t you get about that statement ?
You believe(d) and tell others that they have magical properties unknown to engineering and that they are arches, but I showed with a detailed analysis that if you make a structure that wants to straighten out then it will deform in buckling more easily. What can't you grasp about this? I posted a lot of diagrams for you before and you still fail to grasp it! Although I suspect you do by now but you are too compromised by your past marketing hype and publications.
Do you get it that your boat designs are weaker not stronger boats? The small boats are apparently strong enough, they dent a bit too easily in some areas, but importantly thay will not scale to 60 feet without being abysmally weak unless they have sufficient transverse framing added. That’s my message, all this bluster and BS from you is simply trying to mask the simple fact and that you don’t know what you are talking about.
On BD.net . Mike (and Troy, and the rest of the hecklers sqaud) supported the idea that those many reknown designers Bob mentioned, including Bob Perry himself , who don't have paper qualifications, should be barred from designing boats,
For a start lets just make it clear that you just made that up about Bob Perry. Why invent so many outrageous lies? Then when you are shown to be lying you have no remorse or sense of guilt, that’s pretty brazen.
To address the issue of qualification: It's very clear to everyone in the industry that yacht designers don't need professional qualifications because they are covered very effectively by classification society rule and design standards which removes all their personal liability. You only need pro qualifications for areas where the class society needs specific design outside of class rules signed off by a suitably indemnified person. That’s usually not required for yacht designers.
Yacht designers are better off working in a design office and getting their experience from another yacht designer, and only working with engineers where they want specific engineering design. No one ever said otherwise did they Brent !
To get some qualifications on paper doesn't require the ability to think,..........
Brent, there are simple engineering concepts that reading your posts I honestly doubt you could even grasp. I can set you a very simple challenge to illustrate this and challenge your myopic view certainly of physics and engineering graduate level education.